Light Function, multiple textures switch on/off

Development Rendering
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1

Hi there,

I’m quite a rookie in the Materials creation. Anyway I’m trying to have a light with shadow shapes in it. I can achieve that with Light Functions. What I’d like to do, is to have up to let’s say 4 different shapes. Those may be all active and overlapping, or only 2 might be “active” or even none. Now, how can I (using a material instance I guess) tell the material show this one texture but don’t show that other ones. Do I have to multiply the tex with 0 or 1 to switch on and off?

On a side note, would it be more performing to have hidden, shadow casting geometry in front of the light or using the above Light Function?

Thank you.

2

you can use LinearInterpolate in material. Using it with 0 will show 1st texture, 1 - 2nd.

Few Lerps with few alpha parameters allows you to interpolate between them.

Or you can use simple Add node.

3

thanks mate. I’ll try it out today. That’s what I’m planning to do. Lerp a texture with alpha parameter. Then add it to the next (lerped) texture. If I get it right this way I can set the alpha param to 0 or 1 for each texture and achieve showing or not.