StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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90 lines
2.0 KiB
90 lines
2.0 KiB
var identity = require('./identity');
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module.exports = lookAt;
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/**
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* Generates a look-at matrix with the given eye position, focal point, and up axis
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*
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* @param {mat4} out mat4 frustum matrix will be written into
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* @param {vec3} eye Position of the viewer
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* @param {vec3} center Point the viewer is looking at
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* @param {vec3} up vec3 pointing up
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* @returns {mat4} out
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*/
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function lookAt(out, eye, center, up) {
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var x0, x1, x2, y0, y1, y2, z0, z1, z2, len,
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eyex = eye[0],
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eyey = eye[1],
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eyez = eye[2],
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upx = up[0],
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upy = up[1],
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upz = up[2],
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centerx = center[0],
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centery = center[1],
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centerz = center[2];
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if (Math.abs(eyex - centerx) < 0.000001 &&
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Math.abs(eyey - centery) < 0.000001 &&
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Math.abs(eyez - centerz) < 0.000001) {
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return identity(out);
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}
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z0 = eyex - centerx;
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z1 = eyey - centery;
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z2 = eyez - centerz;
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len = 1 / Math.sqrt(z0 * z0 + z1 * z1 + z2 * z2);
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z0 *= len;
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z1 *= len;
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z2 *= len;
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x0 = upy * z2 - upz * z1;
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x1 = upz * z0 - upx * z2;
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x2 = upx * z1 - upy * z0;
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len = Math.sqrt(x0 * x0 + x1 * x1 + x2 * x2);
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if (!len) {
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x0 = 0;
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x1 = 0;
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x2 = 0;
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} else {
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len = 1 / len;
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x0 *= len;
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x1 *= len;
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x2 *= len;
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}
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y0 = z1 * x2 - z2 * x1;
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y1 = z2 * x0 - z0 * x2;
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y2 = z0 * x1 - z1 * x0;
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len = Math.sqrt(y0 * y0 + y1 * y1 + y2 * y2);
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if (!len) {
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y0 = 0;
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y1 = 0;
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y2 = 0;
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} else {
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len = 1 / len;
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y0 *= len;
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y1 *= len;
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y2 *= len;
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}
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out[0] = x0;
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out[1] = y0;
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out[2] = z0;
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out[3] = 0;
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out[4] = x1;
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out[5] = y1;
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out[6] = z1;
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out[7] = 0;
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out[8] = x2;
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out[9] = y2;
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out[10] = z2;
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out[11] = 0;
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out[12] = -(x0 * eyex + x1 * eyey + x2 * eyez);
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out[13] = -(y0 * eyex + y1 * eyey + y2 * eyez);
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out[14] = -(z0 * eyex + z1 * eyey + z2 * eyez);
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out[15] = 1;
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return out;
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}; |