Set Texture Blend Amount (Percentage) in RhinoCommon?

Scripting
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1

Subject: How to programmatically set Texture Blend Amount (Percentage) in RhinoCommon?

Hi everyone,

I am currently developing a Grasshopper plugin using C# and I’m working on a custom baking component that handles materials.

In the Rhino UI, we can easily adjust the “intensity” or “blend percentage” of a texture (e.g., Diffuse or Bump) using the percentage slider. However, I am struggling to find the equivalent property or method in RhinoCommon.

I am using the basic Material class as follows:
material.SetBitmapTexture(texturePath);

Is there a way to set the “Texture Amount” (the percentage value) for Diffuse or Bump textures via RhinoCommon or the Grasshopper API? Should I be looking into RenderMaterial.SetParameter, and if so, what are the specific parameter names for these values?

Any guidance or code snippets would be greatly appreciated.

Best regards,
@Mahdiyar

  
    private void ApplyMaterialProperties(
        Material material,
        string texturePath,
        string bumpPath,
        Color diffuseColor,
        double reflectivity,
        double reflectionGlossiness,
        double transparency)
    {
        material.DiffuseColor = diffuseColor;
        material.Reflectivity = reflectivity;
        material.RefractionGlossiness = reflectionGlossiness;
        material.Transparency = transparency;

        if (!string.IsNullOrWhiteSpace(texturePath))
            material.SetBitmapTexture(texturePath).;
           

        if (!string.IsNullOrWhiteSpace(bumpPath))
            material.SetBumpTexture(bumpPath);
    }

Screenshot 2026-07-24 165820
Screenshot 2026-07-24 1658201288×770 400 KB

2

You need to use SetAlphaBlendValues on the texture:

private void RunScript(string path, double amount, ref object a)
{
  var texture = new Rhino.DocObjects.Texture
  {
    FileName = path,
    TextureCombineMode = Rhino.DocObjects.TextureCombineMode.Blend
  };

  texture.SetAlphaBlendValues(amount, 1.0, 1.0, 0.0, 0.0);

  var material = new Rhino.DocObjects.Material();
  material.SetBitmapTexture(texture);

  a = material;
}

SetAlphaBlendValues.gh (6.6 KB)