New rendering capabilities

[DP News-Robot]

New Appearance.alphaChannel field (TAppearanceNode.AlphaChannel in Pascal) determines alpha channel treatment when rendering a shape with given appearance. We can use alpha testing, alpha blending, or ignore the alpha channel (render as opaque). This field overrides the engine auto-detection “how to treat alpha”, which normally looks at Material.trasparent and the alpha channels of textures (which can, …