关于opengl画正面半透明立方体问题？

2010-12-08 10:05:25 504 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

【ThreeJs】利用Depth Peel技术，解决模型半透明出现的碎三角面问题在ThreeJS中，模型半透明设置只需要很简单的两行代码 curMat.opacity = 0.5 // 50%透明度 curMat.transparent = curMat.opacity &lt; 1 // transparent属性必须为True才能半透明然而..... 我们的模型有时候出现这种情况，正面看半透明效果似乎正常，正面看半透明效果似乎正常一旦旋转到侧面，就会... 阅读详情

我用opengl画了个立方体，大致如下：
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
useColor(); //给材料设置颜色
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
materials.apply();//正面材料定义（glMaterialfv(GL_FRONT, GL_DIFFUSE, _diffuse.rgba()))正面0.5 materials.apply_back();//背面材料定义(glMaterialfv(GL_BACK, GL_DIFFUSE, d.rgba()))背面1.0
glBegin(GL_QUADS);
glNormal3f(0.0f,0.0f,1.0f);//front
glVertex3f(pointD.getX(), pointD.getY(), pointD.getZ());
glVertex3f(pointC.getX(), pointC.getY(), pointC.getZ());
glVertex3f(pointB.getX(), pointB.getY(), pointB.getZ());
glVertex3f(pointA.getX(), pointA.getY(), pointA.getZ());

glNormal3f(0.0f,0.0f,-1.0f);//back
glVertex3f(pointH.getX(), pointH.getY(), pointH.getZ());
glVertex3f(pointG.getX(), pointG.getY(), pointG.getZ());
glVertex3f(pointF.getX(), pointF.getY(), pointF.getZ());
glVertex3f(pointE.getX(), pointE.getY(), pointE.getZ());

glNormal3f(-1.0f,0.0f,0.0f);//legt
glVertex3f(pointG.getX(), pointG.getY(), pointG.getZ());
glVertex3f(pointD.getX(), pointD.getY(), pointD.getZ());
glVertex3f(pointA.getX(), pointA.getY(), pointA.getZ());
glVertex3f(pointF.getX(), pointF.getY(), pointF.getZ());

glNormal3f(1.0f,0.0f,0.0f);//right
glVertex3f(pointC.getX(), pointC.getY(), pointC.getZ());
glVertex3f(pointH.getX(), pointH.getY(), pointH.getZ());
glVertex3f(pointE.getX(), pointE.getY(), pointE.getZ());
glVertex3f(pointB.getX(), pointB.getY(), pointB.getZ());

glNormal3f(0.0f,1.0f,0.0f);//top
glVertex3f(pointA.getX(), pointA.getY(), pointA.getZ());
glVertex3f(pointB.getX(), pointB.getY(), pointB.getZ());
glVertex3f(pointE.getX(), pointE.getY(), pointE.getZ());
glVertex3f(pointF.getX(), pointF.getY(), pointF.getZ());

glNormal3f(0.0f,-1.0f,0.0f);//bottom
glVertex3f(pointC.getX(), pointC.getY(), pointC.getZ());
glVertex3f(pointD.getX(), pointD.getY(), pointD.getZ());
glVertex3f(pointG.getX(), pointG.getY(), pointG.getZ());
glVertex3f(pointH.getX(), pointH.getY(), pointH.getZ());
glEnd();
可是看到的立方体确实正反面都是半透明的，问什么？？我忘了设置什么了吗？？

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