98 lines
2.7 KiB
JavaScript
98 lines
2.7 KiB
JavaScript
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//
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// cameraIngame.js
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//--------------------
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// The ingame camera that follows the kart from behind.
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// by RHY3756547
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//
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// includes: main.js
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//
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window.cameraIngame = function(kart) {
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var thisObj = this;
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this.kart = kart;
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this.getView = getView;
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this.targetShadowPos = [0, 0, 0]
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var mat = mat4.create();
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var camOffset = [0, 32, -48]
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var lookAtOffset = [0, 16, 0]
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var camNormal = [0, 1, 0];
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var camAngle = 0;
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var boostOff = 0;
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function getView(scene) {
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var basis = buildBasis();
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var camPos = vec3.transformMat4([], camOffset, basis);
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var lookAtPos = vec3.transformMat4([], lookAtOffset, basis);
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vec3.scale(camPos, camPos, 1/1024);
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vec3.scale(lookAtPos, lookAtPos, 1/1024);
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var mat = mat4.lookAt(mat4.create(), camPos, lookAtPos, [0, 1, 0]);
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var kpos = vec3.clone(kart.pos);
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if (kart.drifting && !kart.driftLanded && kart.ylock>0) kpos[1] -= kart.ylock;
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mat4.translate(mat, mat, vec3.scale([], kpos, -1/1024));
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//interpolate visual normal roughly to target
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camNormal[0] += (kart.kartNormal[0]-camNormal[0])*0.075;
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camNormal[1] += (kart.kartNormal[1]-camNormal[1])*0.075;
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camNormal[2] += (kart.kartNormal[2]-camNormal[2])*0.075;
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vec3.normalize(camNormal, camNormal);
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camAngle += dirDiff(kart.physicalDir+kart.driftOff/2, camAngle)*0.075;
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camAngle = fixDir(camAngle);
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boostOff += (((kart.boostNorm+kart.boostMT > 0)?5:0) - boostOff)*0.075
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var p = mat4.perspective(mat4.create(), ((70+boostOff)/180)*Math.PI, gl.viewportWidth / gl.viewportHeight, 0.01, 10000.0);
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var dist = 192;
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this.targetShadowPos = vec3.add([], kart.pos, [Math.sin(kart.angle)*dist, 0, -Math.cos(kart.angle)*dist])
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thisObj.view = {p:p, mv:mat};
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return thisObj.view;
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}
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function buildBasis() {
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//order y, x, z
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var basis = gramShmidt(camNormal, [Math.cos(camAngle), 0, Math.sin(camAngle)], [Math.sin(camAngle), 0, -Math.cos(camAngle)]);
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var temp = basis[0];
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basis[0] = basis[1];
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basis[1] = temp; //todo: cleanup
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return [
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basis[0][0], basis[0][1], basis[0][2], 0,
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basis[1][0], basis[1][1], basis[1][2], 0,
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basis[2][0], basis[2][1], basis[2][2], 0,
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0, 0, 0, 1
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]
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}
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function gramShmidt(v1, v2, v3) {
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var u1 = v1;
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var u2 = vec3.sub([0, 0, 0], v2, project(u1, v2));
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var u3 = vec3.sub([0, 0, 0], vec3.sub([0, 0, 0], v3, project(u1, v3)), project(u2, v3));
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return [vec3.normalize(u1, u1), vec3.normalize(u2, u2), vec3.normalize(u3, u3)]
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}
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function project(u, v) {
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return vec3.scale([], u, (vec3.dot(u, v)/vec3.dot(u, u)))
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}
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function fixDir(dir) {
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return posMod(dir, Math.PI*2);
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}
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function dirDiff(dir1, dir2) {
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var d = fixDir(dir1-dir2);
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return (d>Math.PI)?(-2*Math.PI+d):d;
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}
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function posMod(i, n) {
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return (i % n + n) % n;
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}
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}
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