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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42 lines
1.3 KiB
42 lines
1.3 KiB
4 years ago
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precision highp float;
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vec3 getOrthogonalVector(vec3 v) {
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// Return up-vector for only-z vector.
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// Return ax + by + cz = 0, a point that lies on the plane that has v as a normal and that isn't (0,0,0).
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// From the above if-statement we have ||a|| > 0 U ||b|| > 0.
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// Assign z = 0, x = -b, y = a:
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// a*-b + b*a + c*0 = -ba + ba + 0 = 0
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if (v.x*v.x > v.z*v.z || v.y*v.y > v.z*v.z) {
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return normalize(vec3(-v.y, v.x, 0.0));
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} else {
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return normalize(vec3(0.0, v.z, -v.y));
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}
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}
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// Calculate the tube vertex and normal at the given index.
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//
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// The returned vertex is for a tube ring with its center at origin, radius of length(d), pointing in the direction of d.
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//
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// Each tube segment is made up of a ring of vertices.
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// These vertices are used to make up the triangles of the tube by connecting them together in the vertex array.
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// The indexes of tube segments run from 0 to 8.
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//
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vec3 getTubePosition(vec3 d, float index, out vec3 normal) {
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float segmentCount = 8.0;
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float angle = 2.0 * 3.14159 * (index / segmentCount);
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vec3 u = getOrthogonalVector(d);
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vec3 v = normalize(cross(u, d));
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vec3 x = u * cos(angle) * length(d);
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vec3 y = v * sin(angle) * length(d);
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vec3 v3 = x + y;
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normal = normalize(v3);
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return v3;
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}
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#pragma glslify: export(getTubePosition)
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