这又是一款基于HTML5 Canvas的3D动画杰作，它是一个可以随风飘动的3D衣服摇摆动画特效，非常逼真。当我们将鼠标滑过衣服时，衣服将会出现摇摆的动画，点击鼠标时，衣服将会更加剧烈地摆动。
HTML代码
<div style="width:500px;margin:10px auto">
<canvas id="cv" width="480" height="300"></canvas>
<p>"3D on 2D Canvas" demo</p>
<p>move cursor to pan / click to swing</p>
</div>
P3D库JS代码，主要用来处理3D效果的
window.P3D = {
texture: null,
g: null
};
P3D.clear = function(f, w, h) {
var g = this.g;
g.beginPath();
g.fillStyle = f;
g.fillRect(0, 0, w, h);
}
P3D.num_cmp = function(a,b){return a-b;}
P3D.drawTriangle = function(poss, uvs, shade_clr) {
var w = this.texture.width;
var h = this.texture.height;
var g = this.g;
var vAd = [ poss[1].x - poss[0].x , poss[1].y - poss[0].y ];
var vBd = [ poss[2].x - poss[0].x , poss[2].y - poss[0].y ];
var vA = [ uvs[1].u - uvs[0].u , uvs[1].v - uvs[0].v ];
var vB = [ uvs[2].u - uvs[0].u , uvs[2].v - uvs[0].v ];
vA[0] *= w;
vA[1] *= h;
vB[0] *= w;
vB[1] *= h;
var m = new M22();
m._11 = vA[0];
m._12 = vA[1];
m._21 = vB[0];
m._22 = vB[1];
var im = m.getInvert();
if (!im) return false;
var a = im._11 * vAd[0] + im._12 * vBd[0];
var b = im._21 * vAd[0] + im._22 * vBd[0];
var c = im._11 * vAd[1] + im._12 * vBd[1];
var d = im._21 * vAd[1] + im._22 * vBd[1];
var wu = uvs[0].u * w;
var hv = uvs[0].v * h;
var du = wu * a + hv * b;
var dv = wu * c + hv * d;
g.save();
g.beginPath();
g.moveTo(poss[0].x, poss[0].y);
g.lineTo(poss[1].x, poss[1].y);
g.lineTo(poss[2].x, poss[2].y);
g.clip();
g.transform(a, c, b, d, poss[0].x - du, poss[0].y - dv);
// bounds
var bx = [wu, wu+vA[0], wu+vB[0]];
var by = [hv, hv+vA[1], hv+vB[1]];
bx.sort(P3D.num_cmp);
by.sort(P3D.num_cmp);
var bw = bx[2] - bx[0];
var bh = by[2] - by[0];
if ((bx[0]+bw) <= (w-1)) bw++;
if ((by[0]+bh) <= (h-1)) bh++;
if (bx[0] >= 1) {bx[0]--; bw++;}
if (by[0] >= 1) {by[0]--; bh++;}
g.drawImage(this.texture, bx[0], by[0], bw, bh, bx[0], by[0], bw, bh);
if (shade_clr) {
g.fillStyle = shade_clr;
g.fillRect(bx[0], by[0], bw, bh);
}
g.restore();
return true;
}
P3D.drawTestByIndexBuffer = function(pos_buf, ix_buf, culling) {
var g = this.g;
if ((ix_buf.length%3) != 0)
throw "invalid index buffer length!";
var len = ix_buf.length/3;
var i, ibase, vbase;
var poss = [{},{},{}];
g.strokeWidth = 1;
for (i = 0, ibase = 0;i < len;++i)
{
vbase = ix_buf[ibase++] << 2;
poss[0].x = pos_buf[vbase++];
poss[0].y = pos_buf[vbase ];
vbase = ix_buf[ibase++] << 2;
poss[1].x = pos_buf[vbase++];
poss[1].y = pos_buf[vbase ];
vbase = ix_buf[ibase++] << 2;
poss[2].x = pos_buf[vbase++];
poss[2].y = pos_buf[vbase ];
// z component of cross product < 0 ?
var Ax = poss[1].x - poss[0].x;
var Ay = poss[1].y - poss[0].y;
var Cx = poss[2].x - poss[1].x;
var Cy = poss[2].y - poss[1].y;
var cull = ( (((Ax * Cy) - (Ay * Cx))*culling) < 0);
g.beginPath();
g.strokeStyle = cull ? "#592" : "#0f0";
g.moveTo(poss[0].x, poss[0].y);
g.lineTo(poss[1].x, poss[1].y);
g.lineTo(poss[2].x, poss[2].y);
g.lineTo(poss[0].x, poss[0].y);
g.stroke();
}
}
P3D.drawByIndexBuffer = function(pos_buf, ix_buf, tx_buf, culling, z_clip) {
var w, h;
var color_polygon = !this.texture;
if (this.texture) {
w = this.texture.width;
h = this.texture.height;
}
var g = this.g;
var m = new M22();
if (!culling) culling = 0;
if ((ix_buf.length%3) != 0)
throw "invalid index buffer length!";
var i, ibase, vbase, tbase, poss = [{},{},{}];
var len = ix_buf.length/3;
var uv_0u, uv_0v, uv_1u, uv_1v, uv_2u, uv_2v;
for (i = 0, ibase = 0;i < len;++i)
{
tbase = ix_buf[ibase++] << 1
vbase = tbase << 1;
poss[0].x = pos_buf[vbase++]; uv_0u = tx_buf[tbase++];
poss[0].y = pos_buf[vbase++]; uv_0v = tx_buf[tbase];
if (z_clip && (pos_buf[vbase] < 0 || pos_buf[vbase] > 1)) {ibase += 2; continue;}
tbase = ix_buf[ibase++] << 1
vbase = tbase << 1;
poss[1].x = pos_buf[vbase++]; uv_1u = tx_buf[tbase++];
poss[1].y = pos_buf[vbase++]; uv_1v = tx_buf[tbase];
if (z_clip && (pos_buf[vbase] < 0 || pos_buf[vbase] > 1)) {++ibase; continue;}
tbase = ix_buf[ibase++] << 1
vbase = tbase << 1;
poss[2].x = pos_buf[vbase++]; uv_2u = tx_buf[tbase++];
poss[2].y = pos_buf[vbase++]; uv_2v = tx_buf[tbase];
if (z_clip && (pos_buf[vbase] < 0 || pos_buf[vbase] > 1)) {continue;}
var vAd = [ poss[1].x - poss[0].x , poss[1].y - poss[0].y ];
var vBd = [ poss[2].x - poss[0].x , poss[2].y - poss[0].y ];
var vCd = [ poss[2].x - poss[1].x , poss[2].y - poss[1].y ];
// z component of cross product < 0 ?
if( (((vAd[0] * vCd[1]) - (vAd[1] * vCd[0]))*culling) < 0)
continue;
if (color_polygon) {
g.fillStyle = uv_0u;
g.beginPath();
g.moveTo(poss[0].x, poss[0].y);
g.lineTo(poss[1].x, poss[1].y);
g.lineTo(poss[2].x, poss[2].y);
g.fill();
continue;
}
var vA = [ uv_1u - uv_0u , uv_1v - uv_0v ];
var vB = [ uv_2u - uv_0u , uv_2v - uv_0v ];
vA[0] *= w;
vA[1] *= h;
vB[0] *= w;
vB[1] *= h;
m._11 = vA[0];
m._12 = vA[1];
m._21 = vB[0];
m._22 = vB[1];
var im = m.getInvert();
if (!im) { continue;}
var a = im._11 * vAd[0] + im._12 * vBd[0];
var b = im._21 * vAd[0] + im._22 * vBd[0];
var c = im._11 * vAd[1] + im._12 * vBd[1];
var d = im._21 * vAd[1] + im._22 * vBd[1];
var wu = uv_0u * w;
var hv = uv_0v * h;
var du = wu * a + hv * b;
var dv = wu * c + hv * d;
g.save();
g.beginPath();
g.moveTo(poss[0].x, poss[0].y);
g.lineTo(poss[1].x, poss[1].y);
g.lineTo(poss[2].x, poss[2].y);
g.clip();
g.transform(a, c, b, d, poss[0].x - du, poss[0].y - dv);
// bounds
var bx = [wu, wu+vA[0], wu+vB[0]];
var by = [hv, hv+vA[1], hv+vB[1]];
bx.sort(P3D.num_cmp);
by.sort(P3D.num_cmp);
var bw = bx[2] - bx[0];
var bh = by[2] - by[0];
if ((bx[0]+bw) <= (w-1)) bw++;
if ((by[0]+bh) <= (h-1)) bh++;
if (bx[0] >= 1) {bx[0]--; bw++;}
if (by[0] >= 1) {by[0]--; bh++;}
g.drawImage(this.texture, bx[0], by[0], bw, bh, bx[0], by[0], bw, bh);
/*
if (shade_clr) {
g.fillStyle = shade_clr;
g.fillRect(bx[0], by[0], bw, bh);
}
*/
g.restore();
}
}
function Vec3(_x, _y, _z)
{
this.x = _x || 0;
this.y = _y || 0;
this.z = _z || 0;
}
Vec3.prototype = {
zero: function() {
this.x = this.y = this.z = 0;
},
sub: function(v) {
this.x -= v.x;
this.y -= v.y;
this.z -= v.z;
return this;
},
add: function(v) {
this.x += v.x;
this.y += v.y;
this.z += v.z;
return this;
},
copyFrom: function(v) {
this.x = v.x;
this.y = v.y;
this.z = v.z;
return this;
},
norm:function() {
return Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z);
},
normalize: function() {
var nrm = Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z);
if (nrm != 0)
{
this.x /= nrm;
this.y /= nrm;
this.z /= nrm;
}
return this;
},
smul: function(k) {
this.x *= k;
this.y *= k;
this.z *= k;
return this;
},
dpWith: function(v) {
return this.x*v.x + this.y*v.y + this.z*v.z;
},
cp: function(v, w) {
this.x = (w.y * v.z) - (w.z * v.y);
this.y = (w.z * v.x) - (w.x * v.z);
this.z = (w.x * v.y) - (w.y * v.x);
return this;
},
toString: function() {
return this.x + ", " + this.y + "," + this.z;
}
}
function M44(cpy)
{
if (cpy)
this.copyFrom(cpy);
else {
this.ident();
}
}
M44.prototype = {
ident: function() {
this._12 = this._13 = this._14 = 0;
this._21 = this._23 = this._24 = 0;
this._31 = this._32 = this._34 = 0;
this._41 = this._42 = this._43 = 0;
this._11 = this._22 = this._33 = this._44 = 1;
return this;
},
copyFrom: function(m) {
this._11 = m._11;
this._12 = m._12;
this._13 = m._13;
this._14 = m._14;
this._21 = m._21;
this._22 = m._22;
this._23 = m._23;
this._24 = m._24;
this._31 = m._31;
this._32 = m._32;
this._33 = m._33;
this._34 = m._34;
this._41 = m._41;
this._42 = m._42;
this._43 = m._43;
this._44 = m._44;
return this;
},
transVec3: function(out, x, y, z) {
out[0] = x * this._11 + y * this._21 + z * this._31 + this._41;
out[1] = x * this._12 + y * this._22 + z * this._32 + this._42;
out[2] = x * this._13 + y * this._23 + z * this._33 + this._43;
out[3] = x * this._14 + y * this._24 + z * this._34 + this._44;
},
transVec3Rot: function(out, x, y, z) {
out[0] = x * this._11 + y * this._21 + z * this._31;
out[1] = x * this._12 + y * this._22 + z * this._32;
out[2] = x * this._13 + y * this._23 + z * this._33;
},
perspectiveLH: function(vw, vh, z_near, z_far) {
this._11 = 2.0*z_near/vw;
this._12 = 0;
this._13 = 0;
this._14 = 0;
this._21 = 0;
this._22 = 2*z_near/vh;
this._23 = 0;
this._24 = 0;
this._31 = 0;
this._32 = 0;
this._33 = z_far/(z_far-z_near);
this._34 = 1;
this._41 = 0;
this._42 = 0;
this._43 = z_near*z_far/(z_near-z_far);
this._44 = 0;
return this;
},
lookAtLH: function(aUp, aFrom, aAt) {
var aX = new Vec3();
var aY = new Vec3();
var aZ = new Vec3(aAt.x, aAt.y, aAt.z);
aZ.sub(aFrom).normalize();
aX.cp(aUp, aZ).normalize();
aY.cp(aZ, aX);
this._11 = aX.x; this._12 = aY.x; this._13 = aZ.x; this._14 = 0;
this._21 = aX.y; this._22 = aY.y; this._23 = aZ.y; this._24 = 0;
this._31 = aX.z; this._32 = aY.z; this._33 = aZ.z; this._34 = 0;
this._41 = -aFrom.dpWith(aX);
this._42 = -aFrom.dpWith(aY);
this._43 = -aFrom.dpWith(aZ);
this._44 = 1;
return this;
},
mul: function(A, B) {
this._11 = A._11*B._11 + A._12*B._21 + A._13*B._31 + A._14*B._41;
this._12 = A._11*B._12 + A._12*B._22 + A._13*B._32 + A._14*B._42;
this._13 = A._11*B._13 + A._12*B._23 + A._13*B._33 + A._14*B._43;
this._14 = A._11*B._14 + A._12*B._24 + A._13*B._34 + A._14*B._44;
this._21 = A._21*B._11 + A._22*B._21 + A._23*B._31 + A._24*B._41;
this._22 = A._21*B._12 + A._22*B._22 + A._23*B._32 + A._24*B._42;
this._23 = A._21*B._13 + A._22*B._23 + A._23*B._33 + A._24*B._43;
this._24 = A._21*B._14 + A._22*B._24 + A._23*B._34 + A._24*B._44;
this._31 = A._31*B._11 + A._32*B._21 + A._33*B._31 + A._34*B._41;
this._32 = A._31*B._12 + A._32*B._22 + A._33*B._32 + A._34*B._42;
this._33 = A._31*B._13 + A._32*B._23 + A._33*B._33 + A._34*B._43;
this._34 = A._31*B._14 + A._32*B._24 + A._33*B._34 + A._34*B._44;
this._41 = A._41*B._11 + A._42*B._21 + A._43*B._31 + A._44*B._41;
this._42 = A._41*B._12 + A._42*B._22 + A._43*B._32 + A._44*B._42;
this._43 = A._41*B._13 + A._42*B._23 + A._43*B._33 + A._44*B._43;
this._44 = A._41*B._14 + A._42*B._24 + A._43*B._34 + A._44*B._44;
return this;
},
translate: function(x, y, z) {
this._11 = 1; this._12 = 0; this._13 = 0; this._14 = 0;
this._21 = 0; this._22 = 1; this._23 = 0; this._24 = 0;
this._31 = 0; this._32 = 0; this._33 = 1; this._34 = 0;
this._41 = x; this._42 = y; this._43 = z; this._44 = 1;
return this;
},
transpose33: function() {
var t;
t = this._12;
this._12 = this._21;
this._21 = t;
t = this._13;
this._13 = this._31;
this._31 = t;
t = this._23;
this._23 = this._32;
this._32 = t;
return this;
},
// OpenGL style rotation
glRotate: function(angle, x, y, z) {
var s = Math.sin( angle );
var c = Math.cos( angle );
var xx = x * x;
var yy = y * y;
var zz = z * z;
var xy = x * y;
var yz = y * z;
var zx = z * x;
var xs = x * s;
var ys = y * s;
var zs = z * s;
var one_c = 1.0 - c;
/*
this._11 = (one_c * xx) + c;
this._21 = (one_c * xy) - zs;
this._31 = (one_c * zx) + ys;
this._41 = 0;
this._12 = (one_c * xy) + zs;
this._22 = (one_c * yy) + c;
this._32 = (one_c * yz) - xs;
this._42 = 0;
this._13 = (one_c * zx) - ys;
this._23 = (one_c * yz) + xs;
this._33 = (one_c * zz) + c;
this._43 = 0;
this._14 = 0;
this._24 = 0;
this._34 = 0;
this._44 = 1;
*/
this._11 = (one_c * xx) + c;
this._12 = (one_c * xy) - zs;
this._13 = (one_c * zx) + ys;
this._14 = 0;
this._21 = (one_c * xy) + zs;
this._22 = (one_c * yy) + c;
this._23 = (one_c * yz) - xs;
this._24 = 0;
this._31 = (one_c * zx) - ys;
this._32 = (one_c * yz) + xs;
this._33 = (one_c * zz) + c;
this._34 = 0;
this._41 = 0;
this._42 = 0;
this._43 = 0;
this._44 = 1;
return this;
}
}
// matrix 2x2
function M22()
{
this._11 = 1;
this._12 = 0;
this._21 = 0;
this._22 = 1;
}
M22.prototype.getInvert = function()
{
var out = new M22();
var det = this._11 * this._22 - this._12 * this._21;
if (det > -0.0001 && det < 0.0001)
return null;
out._11 = this._22 / det;
out._22 = this._11 / det;
out._12 = -this._12 / det;
out._21 = -this._21 / det;
return out;
}
3D衣服动画JS代码
function ClothApp()
{
this.canvas = document.getElementById("cv");
P3D.g = this.canvas.getContext("2d");
var tex = new Image();
this.texture1 = tex;
tex.onload = function(){ _this.start(); };
tex.src = "20090226032826.gif";
tex = new Image();
this.texture2 = tex;
tex.onload = function(){ _this.start(); };
tex.src = "20090226032825.png";
this.mLoadCount = 2;
this.mTickCount = 0;
this.G = 0.53;
this.G1 = 0.45;
this.mProjMat = null;
this.mViewMat = null;
this.mViewFrom = new Vec3();
this.mViewFrom.y = -150;
this.mViewFrom.z = 1000;
this.mViewFromA = (new Vec3()).copyFrom(this.mViewFrom);
this.mViewAngle = 0;
this.mNLen = 0;
this.mNodes = [];
this.mRenderTris = null;
this.mLTNode = null;
this.mRTNode = null;
this.mLTNodeV = new Vec3();
this.mRTNodeV = new Vec3();
this.mWForce = new Vec3();
this.frate = 15;
var _this = this;
}
ClothApp.zsortCmp = function(t1, t2) {
return t2.sortKey - t1.sortKey;
}
ClothApp.prototype = {
start: function() {
if (--this.mLoadCount != 0) return;
this.vUP = new Vec3(0, 1, 0);
this.vAT = new Vec3(0, 80, 0);
this.mViewport = {};
this.mViewport.w = 480;
this.mViewport.h = 300;
this.mViewport.ow = 240;
this.mViewport.oh = 150;
this.setupTransforms();
this.generateCloth(180);
this.generateRenderTriangles();
var _this = this;
this.canvas.addEventListener("mousemove", function(e){_this.onMouseMove(e);}, false);
this.canvas.addEventListener("mousedown", function(e){_this.onClick(e);}, false);
window.setTimeout(function(){_this.onInterval();}, this.frate);
},
onInterval: function() {
this.mTickCount++;
// this.mLTNodeV.z = Math.cos(this.mTickCount*0.1) * 2;
this.tick();
this.updatePosition();
this.draw();
var _this = this;
window.setTimeout(function(){_this.onInterval();}, this.frate);
},
onMouseMove: function(e) {
if (e.clientX || e.clientX == 0)
this.mViewAngle = (e.clientX - 240) * 0.004;
if (e.clientY || e.clientY == 0)
this.mViewFromA.y = 90 - (e.clientY - 0) * 0.8;
},
onClick: function(e) {
if (e.clientX || e.clientX == 0)
{
this.mWForce.z = -4;
this.mWForce.x = (e.clientX - 240) * -0.03;
}
},
tick: function() {
this.updateViewTrans(this.mViewAngle);
var nlen = this.mNodes.length;
var i, nd;
for(i = 0;i < nlen;i++)
{
nd = this.mNodes[i];
nd.F.x = 0;
nd.F.z = 0;
if (nd.flags & 4)
nd.F.y = -this.G1;
else
nd.F.y = -this.G;
nd.F.add(this.mWForce);
}
this.mWForce.zero();
this.applyTension();
for(i = 0;i < nlen;i++)
{
nd = this.mNodes[i];
if ((nd.flags&1) != 0) {
nd.F.sub(nd.F);
}
nd.velo.add(nd.F);
}
this.mLTNode.velo.copyFrom(this.mLTNodeV);
this.mRTNode.velo.copyFrom(this.mRTNodeV);
},
updatePosition: function() {
var nlen = this.mNodes.length;
var i, nd;
for(i = 0;i < nlen;i++)
{
nd = this.mNodes[i];
if ((nd.flags&1) != 0) {
nd.cv.x = 0;
nd.cv.y = 0;
nd.cv.z = 0;
}
nd.pos.add(nd.velo);
nd.velo.sub(nd.cv);
nd.cv.x = 0;
nd.cv.y = 0;
nd.cv.z = 0;
nd.velo.smul(0.95);
}
},
draw: function() {
P3D.clear("#000", this.mViewport.w, this.mViewport.h);
this.transformPolygons();
this.mRenderTris.sort(ClothApp.zsortCmp);
var len = this.mRenderTris.length;
var t, sh;
for (var i = 0;i < len;i++) {
t = this.mRenderTris[i];
if (P3D.texture != t.texture)
P3D.texture = t.texture;
sh = undefined;
if (t.lighting && t.shade > 0.01)
sh = "rgba(0,0,0,"+t.shade+")";
P3D.drawTriangle(t.tposs, t.uvs, sh);
}
},
applyTension: function() {
var i, k, nd;
var v = new Vec3();
var nlen = this.mNodes.length;
var naturalLen = this.mNLen;
for (k = 0;k < nlen;k++)
{
nd = this.mNodes[k];
var F = nd.F;
for (i = 0;i < 4;i++)
{
var nbr = nd.links[i];
if (!nbr) continue;
var len = v.copyFrom(nbr.pos).sub(nd.pos).norm();
var dlen = len - naturalLen;
if (dlen > 0) {
v.smul(dlen * 0.5 / len);
F.x += v.x;
F.y += v.y;
F.z += v.z;
nd.cv.add(v.smul(0.8));
}
}
}
},
setupTransforms: function() {
this.mProjMat = new M44();
this.mProjMat.perspectiveLH(24, 15, 10, 9000);
this.mViewMat = new M44();
this.updateViewTrans(0);
},
updateViewTrans: function(ry) {
this.mViewFromA.z = Math.cos(ry) * 380;
this.mViewFromA.x = Math.sin(ry) * 380;
this.mViewFrom.smul(0.7);
this.mViewFrom.x += this.mViewFromA.x * 0.3;
this.mViewFrom.y += this.mViewFromA.y * 0.3;
this.mViewFrom.z += this.mViewFromA.z * 0.3;
this.mViewMat.lookAtLH(this.vUP, this.mViewFrom, this.vAT);
},
generateCloth: function(base_y) {
var cols = 9;
var rows = 8;
var step = 22;
this.mNLen = step*0.9;
var w = (cols-1) * step;
var i, k;
for (k = 0;k < rows;k++)
{
for (i = 0;i < cols;i++)
{
var nd = new ClothNode();
nd.pos.x = -(w/2) + i*step;
nd.pos.y = base_y -k*step/2;
nd.pos.z = k*16;
nd.uv.u = i / (cols-1);
nd.uv.v = k / (rows-1);
if (i > 0) {
var prv_nd = this.mNodes[this.mNodes.length-1];
prv_nd.links[1] = nd;
nd.links[0] = prv_nd;
}
if (k > 0) {
var up_nd = this.mNodes[this.mNodes.length-cols];
up_nd.links[4] = nd;
nd.links[3] = up_nd;
}
if (i != 0 && i != 4 && i != (cols-1))
nd.flags |= 4;
this.mNodes.push(nd);
}
}
// fix left-top and right-top
this.mNodes[0 ].flags |= 1;
this.mNodes[4 ].flags |= 1;
this.mNodes[cols-1].flags |= 1;
this.mLTNode = this.mNodes[0 ];
this.mRTNode = this.mNodes[cols-1];
},
generateRenderTriangles: function()
{
if (!this.mRenderTris) this.mRenderTris = [];
var i;
var nd;
var nlen = this.mNodes.length;
for(i = 0;i < nlen;i++)
{
nd = this.mNodes[i];
if (nd.links[1] && nd.links[1].links[4]) {
var t = new RenderTriangle();
t.texture = this.texture1;
t.poss[0] = nd.pos;
t.poss[1] = nd.links[1].pos;
t.poss[2] = nd.links[1].links[4].pos;
t.uvs[0] = nd.uv;
t.uvs[1] = nd.links[1].uv;
t.uvs[2] = nd.links[1].links[4].uv;
this.mRenderTris.push(t);
t = new RenderTriangle();
t.texture = this.texture1;
t.poss[0] = nd.pos;
t.poss[1] = nd.links[1].links[4].pos;
t.poss[2] = nd.links[4].pos;
t.uvs[0] = nd.uv;
t.uvs[1] = nd.links[1].links[4].uv;
t.uvs[2] = nd.links[4].uv;
this.mRenderTris.push(t);
}
}
this.addBGTriangles(this.mNodes[0].pos.y);
},
addBGTriangles: function(by) {
var cols = 4;
var t, x, y, sz = 110;
var ox = -(cols*sz)/2;
var oz = -(cols*sz)/2;
for (y = 0;y < cols;y++) {
for (x = 0;x < cols;x++) {
var bv = ((x+y)&1) * 0.5;
t = new RenderTriangle();
t.texture = this.texture2;
t.poss[0] = new Vec3(ox + x*sz , by, oz + y*sz );
t.poss[1] = new Vec3(ox + x*sz + sz, by, oz + y*sz );
t.poss[2] = new Vec3(ox + x*sz , by, oz + y*sz + sz);
t.uvs[0] = {u:0 , v:bv };
t.uvs[1] = {u:0.5, v:bv };
t.uvs[2] = {u:0 , v:bv+0.5};
if ((x==1 || x==2) && (y==1 || y==2))
this.modifyRoofUV(t, x == 2, bv);
t.lighting = false;
t.zBias = 0.5;
this.mRenderTris.push(t);
t = new RenderTriangle();
t.texture = this.texture2;
t.poss[0] = new Vec3(ox + x*sz , by, oz + y*sz + sz);
t.poss[1] = new Vec3(ox + x*sz + sz, by, oz + y*sz );
t.poss[2] = new Vec3(ox + x*sz + sz, by, oz + y*sz + sz);
t.uvs[0] = {u:0 , v:bv+0.5};
t.uvs[1] = {u:0.5, v:bv };
t.uvs[2] = {u:0.5, v:bv+0.5};
if ((x==1 || x==2) && (y==1 || y==2))
this.modifyRoofUV(t, x == 2, bv);
t.lighting = false;
t.zBias = 0.5;
this.mRenderTris.push(t);
}
}
},
modifyRoofUV: function(t, rv, bv) {
if (rv) {
t.uvs[0].u = 0.5 - t.uvs[0].u;
t.uvs[1].u = 0.5 - t.uvs[1].u;
t.uvs[2].u = 0.5 - t.uvs[2].u;
}
t.uvs[0].u += 0.5;
t.uvs[1].u += 0.5;
t.uvs[2].u += 0.5;
if (rv) {
t.uvs[0].v = 0.5 - t.uvs[0].v + bv + bv;
t.uvs[1].v = 0.5 - t.uvs[1].v + bv + bv;
t.uvs[2].v = 0.5 - t.uvs[2].v + bv + bv;
}
},
transformPolygons: function() {
var trans = new M44();
trans.mul(this.mViewMat, this.mProjMat);
var hw = this.mViewport.ow;
var hh = this.mViewport.oh;
var len = this.mRenderTris.length;
var t;
var spos = [0, 0, 0, 0];
for (var i = 0;i < len;i++) {
t = this.mRenderTris[i];
for (var k = 0;k < 3;k++) {
trans.transVec3(spos, t.poss[k].x, t.poss[k].y, t.poss[k].z);
var W = spos[3];
spos[0] /= W;
spos[1] /= W;
spos[2] /= W;
spos[0] *= this.mViewport.w;
spos[1] *= -this.mViewport.h;
spos[0] += hw;
spos[1] += hh;
t.tposs[k].x = spos[0];
t.tposs[k].y = spos[1];
t.tposs[k].z = spos[2];
}
var v1 = (new Vec3()).copyFrom(t.poss[1]).sub(t.poss[0]).normalize();
var v2 = (new Vec3()).copyFrom(t.poss[2]).sub(t.poss[1]).normalize();
var N = (new Vec3()).cp(v1, v2);
trans.transVec3Rot(spos, N.x, N.y, N.z);
if (t.lighting) {
if (spos[2] > 0)
t.shade = 0.8
else {
t.shade = 0.1 - N.y * 0.6;
if (t.shade < 0) t.shade = 0;
}
}
t.sortKey = Math.floor( (t.tposs[0].z + t.tposs[1].z + t.tposs[2].z + t.zBias) *1000 );
}
}
}
web前端开发学习Q-q-u-n： 784783012 ，分享学习的方法和需要注意的小细节，不停更新最新的教程和学习方法
function ClothNode()
{
this.flags = 0;
this.pos = new Vec3();
this.velo = new Vec3();
this.cv = new Vec3();
this.F = new Vec3();
this.links = [null, null, null, null];
this.uv = {u:0, v:0};
}
function RenderTriangle()
{
this.texture = null;
this.poss = new Array(3);
this.tposs = [new Vec3(), new Vec3(), new Vec3()];
this.uvs = [{u:0, v:0}, {u:0, v:0}, {u:0, v:0}];
this.shade = 0;
this.lighting = true;
this.zBias = 0;
this.sortKey = 0;
}