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DisplayBitmapSetBlendFunction Method
Sets blending function used to determine how this bitmap is blended with the current framebuffer color. The default setting is SourceAlpha for source and OneMinusSourceAlpha for destination. See OpenGL's glBlendFunc for details.

http://www.opengl.org/sdk/docs/man/xhtml/glBlendFunc.xml

Namespace: Rhino.Display
Assembly: RhinoCommon (in RhinoCommon.dll) Version: Rhino 6.0
Syntax
public void SetBlendFunction(
	BlendMode source,
	BlendMode destination
)

Parameters

source
Type: Rhino.DisplayBlendMode
The source blend mode.
destination
Type: Rhino.DisplayBlendMode
The destination blend mode.
See Also