初次提交

第10章 混合与雾/Sample10_4/assets/cft.obj

@@ -0,0 +1,30 @@
+# Max2Obj Version 4.0 Mar 10th, 2001
+#
+# object (null) to come ...
+#
+v  -3.681371 -0.000000 3.975810
+v  3.654120 -0.000000 3.975810
+v  -3.681371 -0.000000 -3.988921
+v  3.654120 -0.000000 -3.988921
+v  -3.681371 8.567677 3.975810
+v  3.654120 8.567677 3.975810
+v  -3.681371 8.567677 -3.988921
+v  3.654120 8.567677 -3.988921
+# 8 vertices
+
+g (null)
+f 1 3 4
+f 4 2 1
+f 5 6 8
+f 8 7 5
+f 1 2 6
+f 6 5 1
+f 2 4 8
+f 8 6 2
+f 4 3 7
+f 7 8 4
+f 3 1 5
+f 5 7 3
+# 12 faces
+
+g

第10章 混合与雾/Sample10_4/assets/frag_light.sh

@@ -0,0 +1,16 @@
+precision mediump float;
+varying vec4 ambient;
+varying vec4 diffuse;
+varying vec4 specular;
+varying float vFogFactor; //雾因子
+void main()                         
+{
+	vec4 objectColor=vec4(0.95,0.95,0.95,1.0);//物体颜色	
+	vec4 fogColor = vec4(0.97,0.76,0.03,1.0);//雾的颜色	
+ 	if(vFogFactor != 0.0){//如果雾因子为0，不必计算光照
+		objectColor = objectColor*ambient+objectColor*specular+objectColor*diffuse;//计算光照之后物体颜色
+		gl_FragColor = objectColor*vFogFactor + fogColor*(1.0-vFogFactor);//物体颜色和雾颜色插值计算最终颜色
+	}else{
+ 	    gl_FragColor=fogColor;
+ 	}
+}

第10章 混合与雾/Sample10_4/assets/vertex_light.sh

@@ -0,0 +1,60 @@
+uniform mat4 uMVPMatrix; //总变换矩阵
+uniform mat4 uMMatrix; //变换矩阵
+uniform vec3 uLightLocation;	//光源位置
+uniform vec3 uCamera;	//摄像机位置
+attribute vec3 aPosition;  //顶点位置
+attribute vec3 aNormal;    //顶点法向量
+varying vec4 ambient;
+varying vec4 diffuse;
+varying vec4 specular; 
+varying float vFogFactor; //雾因子
+
+//定位光光照计算的方法
+void pointLight(					//定位光光照计算的方法
+  in vec3 normal,				//法向量
+  inout vec4 ambient,			//环境光最终强度
+  inout vec4 diffuse,				//散射光最终强度
+  inout vec4 specular,			//镜面光最终强度
+  in vec3 lightLocation,			//光源位置
+  in vec4 lightAmbient,			//环境光强度
+  in vec4 lightDiffuse,			//散射光强度
+  in vec4 lightSpecular			//镜面光强度
+){
+  ambient=lightAmbient;			//直接得出环境光的最终强度  
+  vec3 normalTarget=aPosition+normal;	//计算变换后的法向量
+  vec3 newNormal=(uMMatrix*vec4(normalTarget,1)).xyz-(uMMatrix*vec4(aPosition,1)).xyz;
+  newNormal=normalize(newNormal); 	//对法向量规格化
+  //计算从表面点到摄像机的向量
+  vec3 eye= normalize(uCamera-(uMMatrix*vec4(aPosition,1)).xyz);  
+  //计算从表面点到光源位置的向量vp
+  vec3 vp= normalize(lightLocation-(uMMatrix*vec4(aPosition,1)).xyz);  
+  vp=normalize(vp);//格式化vp
+  vec3 halfVector=normalize(vp+eye);	//求视线与光线的半向量    
+  float shininess=50.0;				//粗糙度，越小越光滑
+  float nDotViewPosition=max(0.0,dot(newNormal,vp)); 	//求法向量与vp的点积与0的最大值
+  diffuse=lightDiffuse*nDotViewPosition;				//计算散射光的最终强度
+  float nDotViewHalfVector=dot(newNormal,halfVector);	//法线与半向量的点积 
+  float powerFactor=max(0.0,pow(nDotViewHalfVector,shininess)); 	//镜面反射光强度因子
+  specular=lightSpecular*powerFactor;    			//计算镜面光的最终强度
+}
+//计算雾因子的方法
+float computeFogFactor(){
+   float fogDistance = length(uCamera-(uMMatrix*vec4(aPosition,1)).xyz);//顶点到摄像机的距离
+   const float end = 490.0;//雾结束位置
+   const float start = 350.0;//雾开始位置   
+   float tmpFactor = 1.0-smoothstep(start,end,fogDistance);//计算雾因子
+   return tmpFactor;  
+}
+void main()     
+{
+   gl_Position = uMVPMatrix * vec4(aPosition,1); //根据总变换矩阵计算此次绘制此顶点位置
+   vec4 ambientTemp, diffuseTemp, specularTemp;   //存放环境光、散射光、镜面反射光的临时变量   
+     
+   pointLight(normalize(aNormal),ambientTemp,diffuseTemp,specularTemp,uLightLocation,vec4(0.4,0.4,0.4,1.0),vec4(0.7,0.7,0.7,1.0),vec4(0.3,0.3,0.3,1.0));
+   
+   ambient=ambientTemp;
+   diffuse=diffuseTemp;
+   specular=specularTemp;
+   //计算雾因子
+   vFogFactor = computeFogFactor();
+}

第10章 混合与雾/Sample10_4/assets/yh.obj

@@ -0,0 +1,874 @@
+# Max2Obj Version 4.0 Mar 10th, 2001
+#
+# object (null) to come ...
+#
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+# 288 vertices
+
+g (null)
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