I’m setting all alpha values to 0 but it seems like it’s not affecting the opacity of the points. I thought it had something to do with Pre-Multiply by Alpha but after reading a bit about it I’m not sure I’m thinking about this correctly. What am I missing?
The points in the point viewers don’t “show alpha” (aka make the points disappear) if that’s what you’re looking at. You have to render those points with something like a Render TOP or Render Simple TOP before the alpha value can come into play - AKA use a material with alpha transparency.
That makes a lot more sense now thank you. I have a field Pop that defines a circular region on a grid, then assigning the weights to the alpha channel, and I’m trying to learn how to render only the points with a weight/alpha > 0. I’m looking at different MATs and docs but I’m having trouble putting 2 and 2 together.
base1.tox (160.0 KB)
One thing you can do to immediately see a difference is to turn on the “Delete Zeros” parameter at the bottom of the first tab of parameters in the Field POP.
Also one issue is that you are trying to multiply the weight by the alpha, but the alpha coming in aka Color(3) is already at zero coming into the field POP.
Also the Line MAT might not utilize the incoming point color since POPs are new, Line MAT is a very odd Material type, and using point color for rendering / materials is not common.
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