UIKnob.drawTrail

Undocumented in source. Be warned that the author may not have intended to support it.
class UIKnob
nothrow @nogc nothrow @nogc
void
drawTrail
(
ImageRef!RGBA diffuseMap
,
ImageRef!L16 depthMap
,
ImageRef!RGBA materialMap
,
box2i[] dirtyRects
)

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