Color RGB on a texture

KennethLindhardt1

Hi, is it possible you read a pictures combined RGB values. I’m trying to figure out a way to determine how light or dark a texture is, and I was wondering if I could do something similar like when you read the RGB values on for ex. A rooftop from the map layer?

 

Thanks.

CherylLau

That's a good use case.  Thanks for sharing.

If you have a texture in one layer and initial shapes in another layer, for each shape you could access the texture's RGB values by connecting rule attributes to layer attributes.  This would probe the texture at the xz location that corresponds to the center of the shape's scope.

However, if you have a texture that is used within a cga rule (for example, if you put it on a facade or any part of a generated model), you won't be able to access its RGB values in the middle of rule derivation.  This is what I was saying is not possible, which is, I think, what you want.

If you only care about textures that appear in the xz plane (e.g. roof), then one far fetched idea would be to generate your models with the texture, then convert them to shapes (so that they are in another layer called A).  Then, you can create another layer B containing shapes, where each roof is divided into multiple shapes (at your desired sampling resolution).  Then, the each roof shape in B can sample the texture by connecting through layer attributes to layer A.  But, this won't work for vertical facades, and it's a tedious workflow.