Which is faster: Blend Mode

OpenGL OpenGL: Basic Coding
1

Hi,

Which is generally the better method to use in a scene where some objects have varying degrees of alpha while others remain opaque:

  1. Set up GL_BLEND to be enabled all the time, and then give opaque objects an alpha of 1.

  2. Enable GL_BLEND for only the objects that will be blended, and disable it when drawing the opaque.

Thanks.

2

Quite sure it’s (2), especially if you group all your transparent objects and you render them after non-transparent objects have been rendered.

3

and one rule-of-the-thumb is first to render all non-transparent objects and then render all transparent objects.

4

I have a strange feeling of deja-vu.