简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Rumah > hujung hadapan web > Tutorial H5 > teks badan

详细介绍HTML5 3D衣服摇摆动画特效如何实现

黄舟
Lepaskan： 2017-03-24 16:49:05
asal
3514 orang telah melayarinya

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。

在线演示源码下载

HTML代码

<p 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>
</p>
Salin selepas log masuk

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;
}
Salin selepas log masuk

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 );
		}
	}
}

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;
}
Salin selepas log masuk

在线演示源码下载

 以上就是详细介绍HTML5 3D衣服摇摆动画特效如何实现的内容，更多相关内容请关注PHP中文网（www.php.cn）！

相关文章：

简单做出HTML5翻页效果文字特效

CSS比较常用的翻转特效

css实现3D立方体旋转特效的示例代码

Label berkaitan：
HTML5 ，3D衣服摇摆，动画特效
sumber：php.cn
Artikel sebelumnya：HTML5 Google电吉他 可用键盘弹奏的图文代码介绍 Artikel seterusnya：HTML5 3D书本翻页动画的图文代码实例
Kenyataan Laman Web ini
Kandungan artikel ini disumbangkan secara sukarela oleh netizen, dan hak cipta adalah milik pengarang asal. Laman web ini tidak memikul tanggungjawab undang-undang yang sepadan. Jika anda menemui sebarang kandungan yang disyaki plagiarisme atau pelanggaran, sila hubungi admin@php.cn
Artikel terbaru oleh pengarang
Isu terkini
function_exists() tidak boleh menentukan fungsi tersuai Ujian fungsi () {return true;} jika (function_exists ('test')) {echo "test is functio...
daripada 2024-04-29 11:01:01
0
2
1732
Bagaimana untuk memaparkan versi mudah alih Google Chrome Hello cikgu, bagaimana saya boleh menukar Google Chrome kepada versi mudah alih?
daripada 2024-04-23 00:22:19
0
10
1886
Tetingkap anak mengendalikan tetingkap induk, tetapi output tidak bertindak balas. Dua ayat pertama boleh dilaksanakan, tetapi ayat terakhir tidak boleh dilaksanakan.
daripada 2024-04-19 15:37:47
0
1
1599
Tiada output dalam tetingkap induk document.onclick = function(){ window.opener.document.write('Saya adalah output tetingkap ...
daripada 2024-04-18 23:52:34
0
1
1511
Di manakah perisian kursus tentang pemetaan minda CSS? Perisian kursus
daripada 2024-04-16 10:10:18
0
0
1548
Topik-topik yang berkaitan
Lagi>
Cadangan popular
Tutorial Popular
Lagi>
Tutorial berkaitan
Cadangan popular
Kursus terkini
Muat turun terkini
Lagi>
kesan web
Kod sumber laman web
Bahan laman web
Templat hujung hadapan
Tentang kita Penafian Sitemap
Laman web PHP Cina：Latihan PHP dalam talian kebajikan awam，Bantu pelajar PHP berkembang dengan cepat！