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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | import { vec3 } from 'gl-matrix';
import type { Point3 } from '../types';
import { transformWorldToIndexContinuous } from './transformWorldToIndex';
/**
* Calculates the volume direction vectors using the camera vectors.
* @param imageData - Volume's image data
* @param camera - Camera
* @returns Direction vetors in world and index spaces
*/
function getVolumeDirectionVectors(imageData, camera) {
const { viewUp, viewPlaneNormal } = camera;
const ijkOrigin = transformWorldToIndexContinuous(imageData, [0, 0, 0]);
const worldVecColDir = vec3.negate(vec3.create(), viewUp);
const worldVecSliceDir = vec3.negate(vec3.create(), viewPlaneNormal);
const worldVecRowDir = vec3.cross(
vec3.create(),
worldVecColDir,
worldVecSliceDir
);
const ijkVecColDir = vec3.sub(
vec3.create(),
transformWorldToIndexContinuous(imageData, worldVecColDir as Point3),
ijkOrigin
);
// const ijkVecSlice = vec3.negate(vec3.create(), viewPlaneNormal);
const ijkVecSliceDir = vec3.sub(
vec3.create(),
transformWorldToIndexContinuous(imageData, worldVecSliceDir as Point3),
ijkOrigin
);
vec3.normalize(ijkVecColDir, ijkVecColDir);
vec3.normalize(ijkVecSliceDir, ijkVecSliceDir);
const ijkVecRowDir = vec3.cross(vec3.create(), ijkVecColDir, ijkVecSliceDir);
return {
worldVecRowDir,
worldVecColDir,
worldVecSliceDir,
ijkVecRowDir,
ijkVecColDir,
ijkVecSliceDir,
};
}
export { getVolumeDirectionVectors as default, getVolumeDirectionVectors };
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