Computer Graphics & Visualization @ufrj.br
Canvas primerCanvas primer IISVG IntroMinimal WebGL ProgramWebGL primer with reglShadertoy style drawingTransformation demoModelview DemoModel, View and Projection DemoWebGL CubeCatmull Clark SubdivisionThree.js basicsHalf-edge data structureIterated Function SystemsRaytracingTextured sphereEnvironment mappingPhysical animation with shape matchingShape matching2D GJK and EPA algorithmsOmohundro balltree construction algorithmsPlatonic Solids PlaygroundElliptic billiards 3-periodics in space-time3D LabyrinthBrush drawingBump mappingFractal TerrainModel viewerKeyframe animationTextured planeSimple Adaptive Mosaic EffectsWallpaper GroupsRay marchingVolume rendering with slice compositingDisplaying 3D RBFs with ray marchingFunções 2D úteisRandom space-filling curvesGPU-IO3D Apollonian Sphere PackingsCircle inversion fractalsApollonian gasket construction by inversionSmooth PolygonDocument image segmentationB-SplinesStencil bufferNoise LoopsSimplex noise exerciserDeformation with RBFsRandom shapes in a gridHobby curvesLane-Riesenfeld subdivision
Phong Illumination model
regl = createRegl(canvas)
drawObj = regl({
frag: `
precision mediump float;
uniform vec4 color;
varying vec3 vtxNormal;
uniform vec3 lightDir;
uniform vec3 lightColor;
uniform vec3 objColor;
uniform float ambient;
uniform float emission;
uniform float diffuse;
uniform float specular;
uniform float shininess;
void main () {
vec3 normal = normalize(vtxNormal);
float diffuseComp = max(0.0,diffuse * dot(normal,lightDir));
vec3 ref = 2.0*dot(lightDir,normal)*normal - lightDir;
float specularComp = specular*pow(max(0.0,dot(ref,vec3(0.0,0.0,1.0))),shininess);
gl_FragColor = vec4(emission*objColor +
(ambient+diffuseComp)*lightColor*objColor +
specularComp*lightColor, 1.0);
}`,
vert: `
attribute vec3 position;
attribute vec3 normal;
varying vec3 vtxNormal;
uniform mat4 modelview;
uniform mat4 projection;
void main () {
vec4 worldpos = modelview*vec4(position, 1.0);
gl_Position = projection*worldpos;
vtxNormal = (modelview*vec4(normal,0.0)).xyz;
}`,
// These are the vertex attributes that will be passed
// on to the vertex shader
attributes: {
position: obj.pos,
normal: obj.normal
},
// These are the uniforms, i.e., global shader variables that are set
// from inside the host (CPU) program
uniforms: {
objColor: regl.prop("objColor"),
lightColor: regl.prop("lightColor"),
lightDir: regl.prop("lightDir"),
ambient: regl.prop("ambient"),
emission: regl.prop("emission"),
diffuse: regl.prop("diffuse"),
specular: regl.prop("specular"),
shininess: regl.prop("shininess"),
modelview: regl.prop("modelview"),
projection: regl.prop("projection")
},
// The depth buffer
depth: {
enable: true,
func: "<",
mask: true
},
// Try replacing by the following (don't forget to clear depth to 0 in draw)
// depth: {
// enable: true,
// func: ">",
// mask: true
// },
//
// Number of triangles
elements: obj.faces
})
lightDir = vec3.normalize([],
vec3.transformMat3([], xyzToVec3(parameters.light.direction),mat3.fromMat4([],view)))
//
// Draws one frame
//
draw = {
// First clear the frame buffer
regl.clear({
color: [0.8, 0.8, 1.0, 1],
depth: 1
});
// And then draw the triangle
drawObj({
objColor: colorToVec3(parameters.obj.color),
lightColor: colorToVec3(parameters.light.color),
lightDir: lightDir,
ambient: parameters.obj.coefficients.ambient,
emission: parameters.obj.coefficients.emission,
diffuse: parameters.obj.coefficients.diffuse,
specular: parameters.obj.coefficients.specular,
shininess: parameters.obj.coefficients.shininess,
modelview: mat4.mul([], view, model),
projection: projection
});
}
//
// Little utility to add a title to the left of an input, rather than to the top as in the elements
// produced by the Input bazzar.
//
addTitle = function (title,input) {
input.childNodes[0].style.display="inline-block";
input.prepend(html`<span style="font: 700 0.9rem sans-serif;display:inline-block;padding-right:1em;">${title}</span>`);
return input;
}
bunny = {
let obj = parseObj (await FileAttachment("bunny.obj").text());
obj.pos = obj.pos.map (([x,y,z])=>[x+0.4,y-1,z])
return obj
}
teapot = {
let obj = parseObj (await FileAttachment("teapot@1.obj").text());
obj.pos = obj.pos.map(([x,y,z])=>[x/10,y/10,z/10])
return obj
}
obj = parameters.obj.type == "bunny" ? bunny : (parameters.obj.type == "teapot" ? teapot : sphere)
createRegl = require('regl@1.4.2/dist/regl.js')
import {tabbed,paged,combo} from "@esperanc/aggregated-inputs"
import {number,slider,select,color} from "@jashkenas/inputs"
glmatrix = await require('https://bundle.run/gl-matrix@3.3.0')
import {sphere} from "@esperanc/modelview-demo"
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