OpenGL – Build high performance graphics

Rendering a reflective object using dynamic cube mapping

Now we will see how to use dynamic cube mapping to render a real-time scene to a cubemap render target. This allows us to create reflective surfaces. In modern OpenGL, offscreen rendering (also called render-to-texture) functionality is exposed through FBOs.

Getting ready

In this recipe, we will render a box with encircling particles. The code is contained in the Chapter3/DynamicCubemap directory.

How to do it…

Let us get started with the recipe as follows:

1. Create a cubemap texture object.

   glGenTextures(1, &dynamicCubeMapID); glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_CUBE_MAP, dynamicCubeMapID); glTexParameterf(GL_TEXTURE_CUBE_MAP,GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_CUBE_MAP, ...