相关疑难解决方法(0)

我在看OpenGL中的阴影贴图.

我看到代码如下:

// This is matrix transform every coordinate x,y,z
// x = x* 0.5 + 0.5 
// y = y* 0.5 + 0.5 
// z = z* 0.5 + 0.5 
// Moving from unit cube [-1,1] to [0,1]  
const GLdouble bias[16] = {
  0.5, 0.0, 0.0, 0.0,
  0.0, 0.5, 0.0, 0.0,
  0.0, 0.0, 0.5, 0.0,
  0.5, 0.5, 0.5, 1.0};

// Grab modelview and transformation matrices
glGetDoublev(GL_MODELVIEW_MATRIX, modelView);
glGetDoublev(GL_PROJECTION_MATRIX, projection);


glMatrixMode(GL_TEXTURE);
glActiveTextureARB(GL_TEXTURE7);

glLoadIdentity();
glLoadMatrixd(bias);

// concatating all matrice into one. …