2c:null 2d:["$","title",null,{"children":"Section 2.3 - Tanks | Felipe Ferrari | Observable"}] 32:T4b2,md` # Section 2.3 - Tanks Similarly from the compartments we can define the tanks in relation to its identification name, dimensions and locations. The tanks, however, must contain a defined center of gravity, a lightweight, volume capacities, content density, and a fullness that will be defined in Gunnerus.baseObjects. The following arrengement of the top tanks can help to identify each space of the tanks:

The following table indicates the center of gravity and volume of each compartment:

${await FileAttachment("tank_pos.png").image()}

Image: Position of the tanks

Simillarly to the [Section 2.2](https://observablehq.com/@ferrari212/chapter-2-from-ga-to-blocks/2?collection=@ferrari212/from-hull-to-simulation) it is going to be used one of the main tanks, in this case the the oil tank 8.No6.sb.FO.#20-A.settl, as example for explaining each step of the tank definition. The final 3D drawing with all the tanks involved will be made after the explanation. `33:T257b,Gunnerus = ({ "attributes": {}, "designState": { "calculationParameters": { "LWL_design": "", "Draft_design": 2.787, "Cb_design": "", "speed": "", "crew": "", "K": "", "Co": "", "tripDuration": "" }, "objectOverrides": { "common": { "fullness": "" } } }, "data":{ }, "structure": { "hull": { "attributes": { "LOA": 36.25, "BOA": 9.6, "Depth": 6.6, "APP": 2, "bulb": true, "transom": true, "cstern": 0, "prismaticLengthRatio": 0.6, "appendices": {} }, "halfBreadths": { "waterlines": [0, 0.075757576, 0.151515152, 0.227272727, 0.303030303, 0.378787879, 0.454545455, 0.53030303, 0.606060606, 0.681818182, 0.757575758, 0.833333333, 0.909090909, 0.984848485, 1.060606061, 1.136363636], "stations": 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"length": "", "breadth": "", "height": "" }, "capabilities": {}, "file3D": "", "baseState": { "fullness": 0.5 }, "weightInformation": { "contentDensity": 0, "volumeCapacity": 0, "lightweight": 0, "fullnessCGMapping": { "fullnesses": [0, 0.25, 0.5, 0.75, 1], "cgs": [ [0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0] ] } } }], "derivedObjects": [{ "id": "", "baseObject": "", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": "", "yCentre": "", "zBase": "" } }] })34:T4f1,{ const renderer = new THREE.WebGLRenderer({antialias: true}); const scene = new THREE.Scene(); scene.background = new THREE.Color(0xA9CCE3); const height = 600; const aspect = width / height; const camera = new THREE.PerspectiveCamera(50); camera.up.set(0, 0, 1); scene.add(camera); const LOA = ship.structure.hull.attributes.LOA; camera.position.set(0.7 * LOA, 0.7 * LOA, 0.7 * LOA); function onWindowResize() { renderer.setSize(width, height); camera.aspect = width / height; camera.updateProjectionMatrix(); } window.addEventListener('resize', onWindowResize); const controls = new THREE.OrbitControls(camera, renderer.domElement); controls.target = new THREE.Vector3(LOA / 2, 0, 0); controls.update(); invalidation.then(() => renderer.dispose()); renderer.setSize(width, height); renderer.setPixelRatio(devicePixelRatio); scene.add(ship3D); const ambientLight = new THREE.AmbientLight(0xffffff, 0.3); const mainLight = new THREE.DirectionalLight(0xffffff, 1); mainLight.position.set(1, 1, 1); scene.add(ambientLight, mainLight); var animate = function () { requestAnimationFrame( animate ); renderer.render( scene, camera ); }; animate(); yield renderer.domElement; }35:T692d,Gunnerus2 = ({ "attributes": {}, "designState": { "calculationParameters": { "LWL_design": "", "Draft_design": 2.787, "Cb_design": "", "speed": "", "crew": "", "K": "", "Co": "", "tripDuration": "" }, "objectOverrides": { "common": { "fullness": "" } } }, "data":{ }, "structure": { "hull": { 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"capabilities": {}, "file3D": "", "baseState": { "fullness": 0.5 }, "weightInformation": { "contentDensity": 1000, "volumeCapacity": 1.701, "lightweight": 0, "fullnessCGMapping": { "fullnesses": [0.00, 0.25, 0.50, 0.75, 1.00], "cgs": [ [10.45, 2.69, -0.25], [10.92, 2.68, 0.13], [10.97, 2.67, 0.32], [10.98, 2.68, 0.47], [10.98, 2.68, 0.60] ] } } },{ "id": "26.No14.sb.#28-32.Black.w", "affiliations": {}, "boxDimensions": { "length": 2.000, "breadth": 1.650, "height": 0.889 }, "capabilities": {}, "file3D": "", "baseState": { "fullness": 0.5 }, "weightInformation": { "contentDensity": 1000, "volumeCapacity": 1.701, "lightweight": 0, "fullnessCGMapping": { "fullnesses": [0.00, 0.26, 0.51, 0.70, 1.00], "cgs": [ [15.56, -2.14, 0.08], [15.95, -2.56, 0.36], [15.98, -2.63, 0.48], [15.98, -2.65, 0.57], [15.99, -2.66, 0.71] ] } } },{ "id": "27.No14.p.#28-32.Grey.w", "affiliations": {}, "boxDimensions": { "length": 2.000, "breadth": 1.650, "height": 0.889 }, "capabilities": {}, "file3D": "", "baseState": { "fullness": 0.5 }, "weightInformation": { "contentDensity": 1000, "volumeCapacity": 1.701, "lightweight": 0, "fullnessCGMapping": { "fullnesses": [0.00, 0.26, 0.51, 0.70, 1.00], "cgs": [ [15.56, 2.14, 0.08], [15.95, 2.56, 0.36], [15.98, 2.63, 0.48], [15.98, 2.65, 0.57], [15.99, 2.66, 0.71] ] } } }], "derivedObjects": [{ "id": "Tank20", "baseObject": "20.CargoHold.#2-8", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 3.714, "yCentre": 0.000, "zBase": 3.145 } },{ "id": "Tank2", "baseObject": "2.No2.sb.FO.#40-48", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 27.665, "yCentre": -1.385, "zBase": 1.259 } },{ "id": "Tank3", "baseObject": "3.No2.p.FO.#40-48", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 27.665, "yCentre": 1.385, "zBase": 1.259 } },{ "id": "Tank8", "baseObject": "8.No6.sb.FO.#20-A.settl", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 13.102, "yCentre": -0.904, "zBase": 0.627 } },{ "id": "Tank9", "baseObject": "9.No6.p.FO.#20-A", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 13.102, "yCentre": 0.904, "zBase": 0.627 } },{ "id": "Tank15", "baseObject": "15.No11.sb.FO.#17-20.serv", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 9.850, "yCentre": -4.150, "zBase": 2.738 } },{ "id": "Tank16", "baseObject": "16.No11.p.FO.#16-19.serv", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 9.850, "yCentre": 4.150, "zBase": 2.738 } },{ "id": "Tank24", "baseObject": "24.No15.sb.FO.#A-I", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 17.018, "yCentre": -0.906, "zBase": 0.645 } },{ "id": "Tank25", "baseObject": "25.No15.p.FO.#A-I", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 17.018, "yCentre": 0.906, "zBase": 0.645 } },{ "id": "Tank01", "baseObject": "1.No1.#48-51.TW", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 30.702, "yCentre": 0, "zBase": 1.297 } },{ "id": "Tank04", "baseObject": "4.No3.sb.#32-40", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 23.834, "yCentre": -2.620, "zBase": 1.260 } },{ "id": "Tank05", "baseObject": "5.No3.p.#32-40", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 23.834, "yCentre": 2.620, "zBase": 1.260 } },{ "id": "Tank07", "baseObject": "7.No5.#28-37.FW", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 22.330, "yCentre": 0.000, "zBase": 0.951 } },{ "id": "Tank17", "baseObject": "17.No12.#", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 5.751, "yCentre": 0.000, "zBase": 3.363 } },{ "id": "Tank18", "baseObject": "18.No13.sb.#", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 3.606, "yCentre": -4.285, "zBase": 3.225 } },{ "id": "Tank19", "baseObject": "19.No13.p.#", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 3.606, "yCentre": 4.285, "zBase": 3.225 } },{ "id": "Tank6", "baseObject": "6.No4.#37-40.Dry", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 25.246, "yCentre": -0.432, "zBase": 1.102 } },{ "id": "Tank10", "baseObject": "10.No7.sb.#22-26.Black.sew", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 12.992, "yCentre": -2.669, "zBase": 0.656 } },{ "id": "Tank11", "baseObject": "11.No7.p.#22-26.Grey.sew", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 12.992, "yCentre": 2.669, "zBase": 0.656 } },{ "id": "Tank12", "baseObject": "12.No8.#20-22.Sludge", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 11.497, "yCentre": -2.680, "zBase": 0.621 } },{ "id": "Tank13", "baseObject": "13.No9.#18-20.Waste", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 10.497, "yCentre": -2.692, "zBase": 0.587 } },{ "id": "Tank14", "baseObject": "14.No10.#18-22.Bilge", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 10.985, "yCentre": 2.685, "zBase": 0.603 } },{ "id": "Tank27", "baseObject": "27.No14.p.#28-32.Grey.w", "affiliations": { "Deck": "", "SFI": "" }, "referenceState": { "xCentre": 15.988, "yCentre": 2.664, "zBase": 0.706 } }] });36:T4f2,{ const renderer = new THREE.WebGLRenderer({antialias: true}); const scene = new THREE.Scene(); scene.background = new THREE.Color(0xA9CCE3); const height = 600; const aspect = width / height; const camera = new THREE.PerspectiveCamera(50); camera.up.set(0, 0, 1); scene.add(camera); const LOA = ship.structure.hull.attributes.LOA; camera.position.set(0.7 * LOA, 0.7 * LOA, 0.7 * LOA); function onWindowResize() { renderer.setSize(width, height); camera.aspect = width / height; camera.updateProjectionMatrix(); } window.addEventListener('resize', onWindowResize); const controls = new THREE.OrbitControls(camera, renderer.domElement); controls.target = new THREE.Vector3(LOA / 2, 0, 0); controls.update(); invalidation.then(() => renderer.dispose()); renderer.setSize(width, height); renderer.setPixelRatio(devicePixelRatio); scene.add(ship3D2); const ambientLight = new THREE.AmbientLight(0xffffff, 0.3); const mainLight = new THREE.DirectionalLight(0xffffff, 1); mainLight.position.set(1, 1, 1); scene.add(ambientLight, mainLight); var animate = function () { requestAnimationFrame( animate ); renderer.render( scene, camera ); }; animate(); yield renderer.domElement; }37:T3eb6,Ship3D = { //@EliasHasle /* THREE.js Object3D constructed from Vessel.js Ship object. There are some serious limitations to this: 1. null values encountered are assumed to be either at the top or bottom of the given station. 2. The end caps and bulkheads are sometimes corrected with zeros where they should perhaps have been clipped because of null values. */ //var hMat; //global for debugging function Ship3D(ship, stlPath, deckOpacity = 0.2, objectOpacity = 0.5) { THREE.Group.call(this); this.ship = ship; this.normalizer = new THREE.Group(); this.fluctCont = new THREE.Group(); this.fluctCont.rotation.order = "ZYX"; //right? this.cmContainer = new THREE.Group(); this.fluctCont.add(this.cmContainer); this.normalizer.add(this.fluctCont); this.add(this.normalizer); let hull = ship.structure.hull; let LOA = hull.attributes.LOA; let BOA = hull.attributes.BOA; let Depth = hull.attributes.Depth; //console.log("LOA:%.1f, BOA:%.1f, Depth:%.1f",LOA,BOA,Depth); this.position.z = -ship.designState.calculationParameters.Draft_design; //Hull let stations = hull.halfBreadths.stations; let waterlines = hull.halfBreadths.waterlines; let table = hull.halfBreadths.table; //None of these are changed during correction of the geometry. console.log(stations); console.log(waterlines); console.log(table); let N = stations.length; let M = waterlines.length; //Hull side, in principle Y offsets on an XZ plane: //Even though a plane geometry is usually defined in terms of Z offsets on an XY plane, the order of the coordinates for each vertex is not so important. What is important is to get the topology right. This is ensured by working with the right order of the vertices. let hGeom = new THREE.PlaneBufferGeometry( undefined, undefined, N - 1, M - 1 ); let pos = hGeom.getAttribute("position"); let pa = pos.array; //loop1: //zs let c = 0; //Iterate over waterlines for (let j = 0; j < M; j++) { //loop2: //xs //iterate over stations for (let i = 0; i < N; i++) { //if (table[j][i] === null) continue;// loop1; pa[c] = stations[i]; //x //DEBUG, OK. No attempts to read outside of table /*if(typeof table[j] === "undefined") console.error("table[%d] is undefined", j); else if (typeof table[j][i] === "undefined") console.error("table[%d][%d] is undefined", j, i);*/ //y pa[c + 1] = table[j][i]; //y pa[c + 2] = waterlines[j]; //z c += 3; } } //console.error("c-pa.length = %d", c-pa.length); //OK, sets all cells //Get rid of nulls by merging their points with the closest non-null point in the same station: /*I am joining some uvs too. Then an applied texture will be cropped, not distorted, where the hull is cropped.*/ let uv = hGeom.getAttribute("uv"); let uva = uv.array; //Iterate over stations for (let i = 0; i < N; i++) { let firstNumberJ; let lastNumberJ; //Iterate over waterlines let j; for (j = 0; j < M; j++) { let y = table[j][i]; //If this condition is satisfied (number found), //the loop will be quitted //after the extra logic below: if (y !== null) { firstNumberJ = j; lastNumberJ = j; //copy vector for i,j to positions for all null cells below: let c = firstNumberJ * N + i; let x = pa[3 * c]; let y = pa[3 * c + 1]; let z = pa[3 * c + 2]; let d = c; while (firstNumberJ > 0) { firstNumberJ--; d -= N; pa[3 * d] = x; pa[3 * d + 1] = y; pa[3 * d + 2] = z; uva[2 * d] = uva[2 * c]; uva[2 * d + 1] = uva[2 * c + 1]; } break; } console.log("null encountered."); } //Continue up the hull (with same j counter), searching for upper number. This does not account for the existence of numbers above the first null encountered. for (; j < M; j++) { let y = table[j][i]; if (y === null) { console.log("null encountered."); break; } //else not null: lastNumberJ = j; } //copy vector for i,j to positions for all null cells above: let c = lastNumberJ * N + i; let x = pa[3 * c]; let y = pa[3 * c + 1]; let z = pa[3 * c + 2]; let d = c; while (lastNumberJ < M - 1) { lastNumberJ++; d += N; pa[3 * d] = x; pa[3 * d + 1] = y; pa[3 * d + 2] = z; uva[2 * d] = uva[2 * c]; uva[2 * d + 1] = uva[2 * c + 1]; } ////////// } //console.log(pa); pos.needsUpdate = true; uv.needsUpdate = true; hGeom.computeVertexNormals(); //Bow cap: let bowPlaneOffsets = hull.getStation(LOA).map(str => str / (0.5 * BOA)); //normalized let bowCapG = new THREE.PlaneBufferGeometry(undefined, undefined, 1, M - 1); pos = bowCapG.getAttribute("position"); pa = pos.array; //constant x-offset yz plane for (let j = 0; j < M; j++) { pa[3 * (2 * j)] = 1; pa[3 * (2 * j) + 1] = bowPlaneOffsets[j]; pa[3 * (2 * j) + 2] = waterlines[j]; pa[3 * (2 * j + 1)] = 1; pa[3 * (2 * j + 1) + 1] = -bowPlaneOffsets[j]; pa[3 * (2 * j + 1) + 2] = waterlines[j]; } pos.needsUpdate = true; //Aft cap: let aftPlaneOffsets = hull.getStation(0).map(str => str / (0.5 * BOA)); //normalized let aftCapG = new THREE.PlaneBufferGeometry(undefined, undefined, 1, M - 1); pos = aftCapG.getAttribute("position"); pa = pos.array; //constant x-offset yz plane for (let j = 0; j < M; j++) { pa[3 * (2 * j)] = 0; pa[3 * (2 * j) + 1] = -aftPlaneOffsets[j]; pa[3 * (2 * j) + 2] = waterlines[j]; pa[3 * (2 * j + 1)] = 0; pa[3 * (2 * j + 1) + 1] = aftPlaneOffsets[j]; pa[3 * (2 * j + 1) + 2] = waterlines[j]; } pos.needsUpdate = true; //Bottom cap: let bottomPlaneOffsets = hull.getWaterline(0).map(hw => hw / (0.5 * BOA)); //normalized let bottomCapG = new THREE.PlaneBufferGeometry( undefined, undefined, N - 1, 1 ); pos = bottomCapG.getAttribute("position"); pa = pos.array; //constant z-offset xy plane for (let i = 0; i < N; i++) { pa[3 * i] = stations[i]; pa[3 * i + 1] = -bottomPlaneOffsets[i]; pa[3 * i + 2] = 0; pa[3 * (N + i)] = stations[i]; pa[3 * (N + i) + 1] = bottomPlaneOffsets[i]; pa[3 * (N + i) + 2] = 0; } pos.needsUpdate = true; //Hull material let phong = THREE.ShaderLib.phong; let commonDecl = "uniform float wlThreshold;uniform vec3 aboveWL; uniform vec3 belowWL;\nvarying vec3 vPos;"; let hMat = new THREE.ShaderMaterial({ uniforms: THREE.UniformsUtils.merge([ phong.uniforms, { wlThreshold: new THREE.Uniform( ship.designState.calculationParameters.Draft_design / Depth ), aboveWL: new THREE.Uniform(new THREE.Color(0x33aa33)), belowWL: new THREE.Uniform(new THREE.Color(0xaa3333)) } ]), vertexShader: commonDecl + phong.vertexShader .replace("main() {", "main() {\nvPos = position.xyz;") .replace("#define PHONG", ""), fragmentShader: commonDecl + phong.fragmentShader .replace( "vec4 diffuseColor = vec4( diffuse, opacity );", "vec4 diffuseColor = vec4( (vPos.z>wlThreshold)? aboveWL.rgb : belowWL.rgb, opacity );" ) .replace("#define PHONG", ""), side: THREE.DoubleSide, lights: true, transparent: true }); hMat.uniforms.opacity.value = 0.5; let hullGroup = new THREE.Group(); let port = new THREE.Mesh(hGeom, hMat); let starboard = new THREE.Mesh(hGeom, hMat); starboard.scale.y = -1; hullGroup.add(port, starboard); //Caps: hullGroup.add(new THREE.Mesh(bowCapG, hMat)); hullGroup.add(new THREE.Mesh(aftCapG, hMat)); hullGroup.add(new THREE.Mesh(bottomCapG, hMat)); hullGroup.scale.set(LOA, 0.5 * BOA, Depth); this.hullGroup = hullGroup; this.add(hullGroup); //DEBUG, to show only hull: //return; //Decks: var decks = new THREE.Group(); let deckMat = new THREE.MeshPhongMaterial({ color: 0xcccccc /*this.randomColor()*/, transparent: true, opacity: 0.2, side: THREE.DoubleSide }); //deckGeom.translate(0,0,-0.5); let ds = ship.structure.decks; let dk = Object.keys(ds); let stss = stations.map(st => LOA * st); //use scaled stations for now console.log(dk); for (let i = 0; i < dk.length; i++) { let d = ds[dk[i]]; //deck in ship structure //Will eventually use BoxBufferGeometry, but that is harder, because vertices are duplicated in the face planes. let deckGeom = new THREE.PlaneBufferGeometry(1, 1, stss.length, 1); //new THREE.BoxBufferGeometry(1,1,1,sts.length,1,1); console.log("d.zFloor=%.1f", d.zFloor); //DEBUG let zHigh = d.zFloor; let zLow = d.zFloor - d.thickness; let wlHigh = hull.getWaterline(zHigh); let wlLow = hull.getWaterline(zLow); let pos = deckGeom.getAttribute("position"); let pa = pos.array; for (let j = 0; j < stss.length + 1; j++) { let x = d.xAft + (j / stss.length) * (d.xFwd - d.xAft); let y1 = Vessel.f.linearFromArrays(stss, wlHigh, x); let y2 = Vessel.f.linearFromArrays(stss, wlLow, x); let y = Math.min(0.5 * d.breadth, y1, y2); pa[3 * j] = x; pa[3 * j + 1] = y; pa[3 * (stss.length + 1) + 3 * j] = x; pa[3 * (stss.length + 1) + 3 * j + 1] = -y; //test } pos.needsUpdate = true; //DEBUG console.log( "d.xFwd=%.1f, d.xAft=%.1f, 0.5*d.breadth=%.1f", d.xFwd, d.xAft, 0.5 * d.breadth ); console.log(pa); let deck = new THREE.Mesh(deckGeom, deckMat); deck.name = dk[i]; deck.position.z = d.zFloor; //deck.scale.set(d.xFwd-d.xAft, d.breadth, d.thickness); //deck.position.set(0.5*(d.xFwd+d.xAft), 0, d.zFloor); decks.add(deck); } this.decks = decks; this.add(decks); //Bulkheads: var bulkheads = new THREE.Group(); // Individually trimmed geometries like the decks @ferrari212 let bhMat = new THREE.MeshPhongMaterial({ color: 0xcccccc /*this.randomColor()*/, transparent: true, opacity: deckOpacity, side: THREE.DoubleSide }); let bhs = ship.structure.bulkheads; let maxWl = Math.max(...hull.halfBreadths.waterlines) * Depth; //let bhk = Object.keys(bhs); //for (let i = 0; i < bhk.length; i++) { for (let bhk in bhs) { let bh = bhs[bhk]; //bhs[bhk[i]]; let mat = bhMat; let station = hull.getStation(bh.xAft); if (bh.style) { mat = new THREE.MeshPhongMaterial({ color: typeof bh.style.color !== "undefined" ? bh.style.color : 0xcccccc, transparent: true, opacity: typeof bh.style.opacity !== "undefined" ? bh.style.opacity : deckOpacity, side: THREE.DoubleSide }); } let bulkheadGeom = new THREE.PlaneBufferGeometry( maxWl, BOA, station.length - 1, 1 ); let pos = bulkheadGeom.getAttribute("position"); let pa = pos.array; for (let i = 0; i < station.length; i++) { // Check height in order to trim the bulkhead in the deck if (pa[3 * i] < Depth - maxWl / 2) { pa[3 * i + 1] = station[i]; pa[3 * station.length + 3 * i + 1] = -station[i]; } else { pa[3 * i + 1] = pa[3 * station.length + 3 * i + 1] = 0; } } pos.needsUpdate = true; let bulkhead = new THREE.Mesh(bulkheadGeom, mat); bulkhead.name = bhk; //[i]; // The try verification is used to verify if the group affiliation was inserted in the JSON structure, // the affiliation must be decided in the future if it will be incorporate into the main structure of the group // or if there is a better approach to classify it. // @ferrari212 try { bulkhead.group = bh.affiliations.group; } catch (error) { console.warn('Group tag were introduced to bulkhead object'); console.warn(error); } bulkhead.rotation.y = -Math.PI / 2; bulkhead.position.set(bh.xAft, 0, maxWl / 2); bulkheads.add(bulkhead); } this.bulkheads = bulkheads; this.cmContainer.add(bulkheads); //Objects this.materials = {}; this.stlPath = stlPath; let stlManager = new THREE.LoadingManager(); this.stlLoader = new THREE.STLLoader(stlManager); /*stlManager.onLoad = function() { createGUI(materials, deckMat); }*/ this.blocks = new THREE.Group(); this.add(this.blocks); //Default placeholder geometry this.boxGeom = new THREE.BoxBufferGeometry(1, 1, 1); this.boxGeom.translate(0, 0, 0.5); let objects = Object.values(ship.derivedObjects); for (let i = 0; i < objects.length; i++) { this.addObject(objects[i]); } //console.log("Reached end of Ship3D constructor."); } Ship3D.prototype = Object.create(THREE.Group.prototype); Object.assign(Ship3D.prototype, { constructor: Ship3D, addObject: function(object) { let mat; let name = this.stripName(object.id); if (this.materials[name] !== undefined) { mat = this.materials[name]; } else { mat = new THREE.MeshPhongMaterial({ color: this.randomColor(), transparent: true, opacity: 0.5 }); this.materials[name] = mat; } let bo = object.baseObject; //Position let s = this.ship.designState.getObjectState(object); let x = s.xCentre; let y = s.yCentre; let z = s.zBase; //Scale let d = bo.boxDimensions; if (bo.file3D) { let self = this; this.stlLoader.load( this.stlPath + "/" + bo.file3D, function onLoad(geometry) { //Normalize: geometry.computeBoundingBox(); let b = geometry.boundingBox; geometry.translate(-b.min.x, -b.min.y, -b.min.z); geometry.scale( 1 / (b.max.x - b.min.x), 1 / (b.max.y - b.min.y), 1 / (b.max.z - b.min.z) ); //Align with the same coordinate system as placeholder blocks: geometry.translate(-0.5, -0.5, 0); let m = new THREE.Mesh(geometry, mat); m.position.set(x, y, z); m.scale.set(d.length, d.breadth, d.height); self.blocks.add(m); }, undefined, function onError() { //console.warn("Specified file " + e.File + " not found. Falling back on placeholder."); let m = new THREE.Mesh(this.boxGeom, mat); m.position.set(x, y, z); m.scale.set(d.length, d.breadth, d.height); this.blocks.add(m); } ); } else { //Placeholder: let m = new THREE.Mesh(this.boxGeom, mat); m.position.set(x, y, z); m.scale.set(d.length, d.breadth, d.height); this.blocks.add(m); } }, //this function is used as a temporary hack to group similar objects by color stripName: function(s) { s = s.replace(/[0-9]/g, ""); s = s.trim(); return s; }, randomColor: function() { let r = Math.round(Math.random() * 0xff); let g = Math.round(Math.random() * 0xff); let b = Math.round(Math.random() * 0xff); return (r << 16) | (g << 8) | b; } }); return Ship3D; }38:[{"id":"20e6642c077bc9b964dec793d2aae677163a056afce39ac16c0a322e8df8b7b9a9b5c707a98d82ec51c3c08429be28c28b4305a5f2a03800aa4d04adddc7b9a5","href":"https://static.observableusercontent.com/files/20e6642c077bc9b964dec793d2aae677163a056afce39ac16c0a322e8df8b7b9a9b5c707a98d82ec51c3c08429be28c28b4305a5f2a03800aa4d04adddc7b9a5","name":"tank.png","type":"image/png","lastModified":1616335509429.3,"size":152584},{"id":"b9e7bef0c725412074fdff37eaa3ec3b2aee409802dce9e7b2ed291fd37fafeacfdfa871425114348d7043e244a7f9f3c47d6bc76e9f26a0e14f94c92ebcdeeb","href":"https://static.observableusercontent.com/files/b9e7bef0c725412074fdff37eaa3ec3b2aee409802dce9e7b2ed291fd37fafeacfdfa871425114348d7043e244a7f9f3c47d6bc76e9f26a0e14f94c92ebcdeeb","name":"tank_pos.png","type":"image/png","lastModified":1616325815698.034,"size":133793}] 30:{"id":"9eb8e36a1ec635ca","slug":"section-2-2-tanks","title":"Section 2.3 - Tanks","thumbnail":"b9eeafddbf4b78b36433ada7fda97af26307dfc20dd029ade44ecbacbbd25aa7","access_level":"public","create_time":"$D2020-02-23T10:36:34.383Z","update_time":"$D2021-04-15T18:13:22.903Z","view_time":null,"first_public_time":"$D2020-02-23T10:46:31.897Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"d87babdb83b49aab","login":"ferrari212","name":"Felipe Ferrari","avatar_url":"https://avatars-next.observableusercontent.com/9f46888d11f1719173b012c1de36ec52e2071ef6ff70202a1748014cd8f31bbd","tier":"starter_2024"},"version":244,"publish_version":244,"role":null,"authored":false,"authors":[{"type":"individual","id":"a379b02a7775e50b","login":"ferrari212","name":"Felipe Ferrari","avatar_url":"https://avatars-next.observableusercontent.com/9f46888d11f1719173b012c1de36ec52e2071ef6ff70202a1748014cd8f31bbd","tier":null}],"members":[{"type":"individual","id":"a379b02a7775e50b","login":"ferrari212","name":"Felipe Ferrari","avatar_url":"https://avatars-next.observableusercontent.com/9f46888d11f1719173b012c1de36ec52e2071ef6ff70202a1748014cd8f31bbd","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":2,"collection":{"id":"ce744f5722745fd3","slug":"from-hull-to-simulation","title":"From Concept to Simulation","owner":{"id":"d87babdb83b49aab","login":"ferrari212","name":"Felipe Ferrari"}},"type":"notebook","body":{"titling":"auto","title":"Section 2.3 - Tanks","cells":[{"id":0,"value":"$32","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":217,"value":"FileAttachment(\"tank_pos.png\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":60,"value":"$33","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":25,"value":"md`\n### Postion on derived objects\n\nThe location of the tanks must be informed in Gunnerus.derivedObjects. Similarly to the compartments we must use inside the derived objects an identification that relates with the base object. The ids and locations are described bellow:\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":69,"value":"Gunnerus.derivedObjects[0].id = \"Tank8\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":74,"value":"Gunnerus.derivedObjects[0].baseObject = \"8.No6.sb.FO.#20-A.settl\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":64,"value":"Gunnerus.derivedObjects[0].referenceState = {xCentre: 13.102, yCentre: -0.904, zBase: 0.627}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":88,"value":"md`\n### Defining the center of gravity in Base Objects\n\nDifferently from the compartments, the base objects in tanks not only specify its dimensions but relates the center of gravity with fullness of the tank. The volume capacity and content density are also defined in the based objects, here it is shown for the example of oil tank:\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":100,"value":"Gunnerus.baseObjects[0].id = \"8.No6.sb.FO.#20-A.settl\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":103,"value":"Gunnerus.baseObjects[0].boxDimensions = {length: 4.000, breadth: 1.875, height: 1.400}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":112,"value":"Gunnerus.baseObjects[0].weightInformation.contentDensity = 830","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":120,"value":"Gunnerus.baseObjects[0].weightInformation.volumeCapacity = 7.783","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":128,"value":"md`\nRegarding the fullness mapping in the tank it is necessary to relate the tank fullness with the position of the center of gravity at the specific fullness. The fullness is a array with the considered percentages and the center of gravity is a matrix with the specific positions in (x, y, z):\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":136,"value":"Gunnerus.baseObjects[0].weightInformation.fullnessCGMapping.fullnesses = [0.00, 0.25, 0.49, 0.74, 1.00]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":142,"value":"Gunnerus.baseObjects[0].weightInformation.fullnessCGMapping.cgs = [\n\t\t\t\t\t[13.18,\t0.29,\t-0.1],\n\t\t\t\t\t[12.4,\t0.8,\t0.22],\n\t\t\t\t\t[12.21, 0.87, 0.35],\n\t\t\t\t\t[12.14, 0.89, 0.49],\n\t\t\t\t\t[12.1, 0.9, 0.63]\n\t\t\t\t]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":169,"value":"Gunnerus.baseObjects[0]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":171,"value":"ship = new Vessel.Ship(Gunnerus);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":173,"value":"ship3D = new Ship3D(ship);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":177,"value":"$34","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":189,"value":"md`\n### Gunnerus with all tanks\n\nThe whole compartments are ploted bellow as usual after each step in the report:\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":193,"value":"$35","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":202,"value":"ship2 = new Vessel.Ship(Gunnerus2);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":204,"value":"ship3D2 = new Ship3D(ship2);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":208,"value":"$36","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":150,"value":"md `\n

[<< Previous](https://observablehq.com/@ferrari212/chapter-2-from-ga-to-blocks/2?collection=@ferrari212/from-hull-to-simulation) || Top || [Next >>](https://observablehq.com/@ferrari212/section-2-4-equipments-and-stl-elements?collection=@ferrari212/from-hull-to-simulation)

\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":144,"value":"md`### References`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":146,"value":"md `\n**[1] Structure Definition ** – \nIcaro Fonseca [/@icarofonseca/hull-definition-and-hydrostatics](https://observablehq.com/@icarofonseca/hull-definition-and-hydrostatics)\n\n**[2] Object Visualization ** – \nIcaro Fonseca [/@icarofonseca/object-visualization](https://observablehq.com/@icarofonseca/object-visualization)\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":152,"value":"md`### Snippets`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":154,"value":"$37","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":157,"value":"md`### Libraries`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":159,"value":"Vessel = require('ntnu-vessel@0.1.1/vessel.js').catch(() => window[\"Vessel\"]);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":161,"value":"THREE = {\n const THREE = window.THREE = await require(\"three@0.99.0/build/three.min.js\");\n await require(\"three@0.99.0/examples/js/controls/OrbitControls.js\").catch(() => {});\n await require(\"three@0.99.0/examples/js/loaders/STLLoader.js\").catch(() => {});\n return THREE;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":163,"value":"d3 = require(\"d3@5\");","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W38","stdlib":"1"}} 31:"$30:body"