我有一个奇怪的问题，我的法线在渲染地形时不起作用。我的地形渲染得很好，所以我省略了从高度图计算地形点以及如何计算索引的所有代码。我知道我应该使用着色器，但我想在继续之前先解决这个问题。我假设问题来自我在法线生成代码中忽略的一些明显的东西，如下所示：
for (currentind = 0; currentind < indices.size() - 3; currentind+=3)
{
indtopt = indices[currentind] * 3;
point1.vects[0]=terrainpoints[indtopt];//x
point1.vects[1]=terrainpoints[indtopt+1];//y
point1.vects[2]=terrainpoints[indtopt+2];//z
indtopt = indices[currentind+1] * 3;
//second indice
//points of that indice
point2.vects[0]=terrainpoints[indtopt];//x
point2.vects[1]=terrainpoints[indtopt+1];//y
point2.vects[2]=terrainpoints[indtopt+2];//z
indtopt = indices[currentind+2] *3;
//third indice
//points of that indice
point3.vects[0]=terrainpoints[indtopt];//x
point3.vects[1]=terrainpoints[indtopt+1];//y
point3.vects[2]=terrainpoints[indtopt+2];//z
//--------------------------------------------------
point4.vects[0]=(point2.vects[0]-point1.vects[0]);
point4.vects[1]=(point2.vects[1]-point1.vects[1]);
point4.vects[2]=(point2.vects[2]-point1.vects[2]);
point5.vects[0]=(point3.vects[0]-point2.vects[0]);
point5.vects[1]=(point3.vects[1]-point2.vects[1]);
point5.vects[2]=(point3.vects[2]-point2.vects[2]);
//-------------------------------------------------
//cross product
point6.vects[0]=point4.vects[1]*point5.vects[2] - point4.vects[2]*point5.vects[1];
point6.vects[1]=point4.vects[2]*point5.vects[0] - point4.vects[0]*point5.vects[2];
point6.vects[2]=point4.vects[0]*point5.vects[1] - point4.vects[1]*point5.vects[0];
point6 = point6.normalize();
ternormals[currentind]=point6.vects[0];
ternormals[currentind+1]=point6.vects[1];
ternormals[currentind+2]=point6.vects[2];
}
下面是线框和三角形渲染中存在的问题的图片：
如果需要，我可以发布更多代码，但我只是想保持这篇文章简短，所以我试图找到我认为问题可能出在哪里。