Hi,
My scene contains models that use one or many textures, some use vertex and
fragment shaders of different kinds. Complex but good looking :-)
I need to render the scene many times each frame.
The first render is a normal one, so I need no change in textures, states or
shaders.
The second render is a multi target render. Here I need to change all the
fragment shaders that my scene uses. Each shader need to output data to each
render target.
My question is:
- What is the best way to switch shaders on many models in my scene-graph?
One way to do it is to put a shader on the top node and override all child
nodes, but that only works if the entire scene-graph renders with the same
shader. My scene uses different shaders, so overriding is not the solution.
One idea I have is to parse through all scene graphs that I add to my world and
duplicate all nodes that sets a fragment shader. I could then create one shader
for the normal render and one for the multi target render. This would require
that I mask those nodes so that the correct ones are used in each render. This
will require me to write my own function for adding nodes to the scene.
Anyhow, I would be very happy if someone could guide me in the right direction
on this one.
Regards,
Viggo
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