forked from mikael-lovqvist/websperiments
mikael-lovqvists-claude-agent
9600a2bc2a
Interactive WebGL Goldberg polyhedron viewer and painter with PBR shading, adjustable environment lighting, paint tools (pen, brush, circle, fill, line, pick), undo/redo, colour palettes, and mesh relaxation. Added to the standalone experiments index. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
export function mat4_mul(a, b) {
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const out = new Float32Array(16);
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for (let c = 0; c < 4; c++) {
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for (let r = 0; r < 4; r++) {
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let s = 0;
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for (let k = 0; k < 4; k++) { s += a[k*4+r] * b[c*4+k]; }
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out[c*4+r] = s;
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}
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}
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return out;
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}
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export function mat4_perspective(fov, aspect, near, far) {
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const f = 1 / Math.tan(fov / 2), nf = 1 / (near - far);
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return new Float32Array([f/aspect,0,0,0, 0,f,0,0, 0,0,(far+near)*nf,-1, 0,0,2*far*near*nf,0]);
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}
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export function mat4_translate_z(z) {
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return new Float32Array([1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,z,1]);
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}
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export function quat_identity() { return [0, 0, 0, 1]; }
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export function quat_from_axis_angle(ax, ay, az, a) {
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const s = Math.sin(a/2);
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return [ax*s, ay*s, az*s, Math.cos(a/2)];
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}
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export function quat_mul([ax,ay,az,aw], [bx,by,bz,bw]) {
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return [aw*bx+ax*bw+ay*bz-az*by, aw*by-ax*bz+ay*bw+az*bx,
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aw*bz+ax*by-ay*bx+az*bw, aw*bw-ax*bx-ay*by-az*bz];
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}
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export function quat_conj([x,y,z,w]) { return [-x,-y,-z,w]; }
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export function quat_rotate_vec([qx,qy,qz,qw], [vx,vy,vz]) {
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const tx = 2*(qy*vz - qz*vy);
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const ty = 2*(qz*vx - qx*vz);
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const tz = 2*(qx*vy - qy*vx);
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return [vx + qw*tx + qy*tz - qz*ty,
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vy + qw*ty + qz*tx - qx*tz,
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vz + qw*tz + qx*ty - qy*tx];
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}
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export function mat4_from_quat([x,y,z,w]) {
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return new Float32Array([
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1-2*(y*y+z*z), 2*(x*y+w*z), 2*(x*z-w*y), 0,
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2*(x*y-w*z), 1-2*(x*x+z*z), 2*(y*z+w*x), 0,
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2*(x*z+w*y), 2*(y*z-w*x), 1-2*(x*x+y*y), 0,
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0, 0, 0, 1,
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]);
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}
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export function mat3_from_mat4(m) {
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return new Float32Array([m[0],m[1],m[2], m[4],m[5],m[6], m[8],m[9],m[10]]);
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}
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