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Sylvain Lesage
Software engineer at Hugging Face. Prototyping here with JS, d3, three.js.
Published
Edited
Nov 6, 2020
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fSpyParameters
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function createProjCamera(fSpyParameters, { near = 0.01, far = 200 }) {
// field of view (in vertical degrees)
const fov = (fSpyParameters.verticalFieldOfView * 180) / Math.PI;

// aspect ratio
const aspect = fSpyParameters.imageWidth / fSpyParameters.imageHeight;

// Create the camera
const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);

// Position the camera
const matrix4 = new THREE.Matrix4();
matrix4.set(...fSpyParameters.cameraTransform.rows.flat());
camera.applyMatrix4(matrix4);

// camera.setFocalLength(25.049);

// fix the offset, in order the principal point to be the center of the image
camera.setViewOffset(
fSpyParameters.imageWidth,
fSpyParameters.imageHeight,
-(fSpyParameters.principalPoint.x * fSpyParameters.imageWidth) / 2,
(fSpyParameters.principalPoint.y * fSpyParameters.imageHeight) / 2,
fSpyParameters.imageWidth,
fSpyParameters.imageHeight
);

camera.updateMatrixWorld();

return camera;
}
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