how to render a model independently from the light source

OpenGL OpenGL: Basic Coding
1

Hi,

I set up a tool that allows user to adjust the light amount from a light source. Any models’ colors will turn darker or lighter if the light amount is changed. But for a particular model, I want it to be independent from the light source. No matter how dark the environment is, I always want the model to show its full, true colors as if it gains full light. What should I do when rendering this model? Your help is much appreciated.

Tony

2

You might disable lighting (glDisable( GL_LIGHTING))when you draw that model or you can use texture environment (glTexEnv) which does not use vertex color (e.g. GL_REPLACE) when you draw that model.

3

Or just change the intensity of the light source to full before drawing this particular model, and changing it back afterwards…

Depends on what effect you actually want (100% color intensity everywhere, or just 100% light intensity).

4

You might also have the object contain the light-parameters that it “needs”, allowing you to easily keep track of different light settings for different objects.

Another option is to have a list of lights and each object have a pointer into this list (makes it easier if several objects use identical lighting params).