Grasshopper

algorithmic modeling for Rhino

Hi,

 

I'm trying to make a component in C# through visual studio. The idea is that I want to be able to import a coloured mesh, and use the colour value at any point on the mesh. I have made a little method that should be able to find the colour for the closest meshPoint for a point.

 

public

double GetBrightness()     

{

       Color tempColor = mesh.ColorAt(mesh.ClosestMeshPoint(point));

       return tempColor.GetBrightness();

}

 

I plug in a mesh that I have sprayed beforehand. But when I try to get the output from the method all brightness-values are just 1.0, even though this is not the case. Anyone who knows what I might be doing wrong? (The ClosestMeshPoint Method works just fine btw)

 

hope you can help

 

Timo

Views: 988

Replies to This Discussion

I think I wrote the Mesh.ColorAt() function. There could be a bug in there but I'll need some time to figure that out as I'm up to my neck in meetings at the moment.

--

David Rutten

david@mcneel.com

Seattle, WA

Actually the [Mesh Eval] component also doesn't return a colour so I think whatever the bug is, it's my fault not yours. I'll see if I have some time today to narrow it down, but it may take a few days.

--

David Rutten

david@mcneel.com

Seattle, WA

Hi David. Thanks a lot for your quick reply.

I'm looking forwar to hear more from you regarding this. When have a mesh-input and I plug in a painted mesh, will the color values then be transfered with the mesh?

I'm just thinking that if this is the case I will be able to program my own component that can calculate a color value anywhere on the mesh from barycentric coordinates. I would like to be able to avoid having a color input parameter in my component, and just store the color information in the mesh. 

 

Is the problem fixed now because I cannot make it work as well. Thanks.

Attachments:

This method has been broken for a long time.

This is probably not it but in the line if (argb < 0) { return Color.Transparent; }

if you are using a signed integer and the alpha channel (the first 8 bits) is 255, wouldn't it always be negative?

(I'm using the browser to read the Rhinocommon source so I can't test it.)

I still see Mesh.ColorAt() not working.  It always returns Transparent. 

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