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[Marvin Fröhlich]

As you may know, any RenderPass could have its own viewport. This is now also possible to set at Canvas3D/CanvasPeer level. By default the Canvas'es viewport is null. This means, that the current size and a location of (0, 0) is used.
If a RenderPass has a non-null viewport, then this setting overrules the Canvas'es viewport for this RenderPass (as it is for all other RenderPass configs.

Additionally there's a new property on CanvasPeer level called getMaxViewport(), that will return a maximum sized viewport (with no effect, just for information). This property is fetched from OpenGL at Canvas creation time. The properties max-texture-size and max-texture-units are now also fetched at canvas creation time and not with hte first frame.

Marvin