vtkScalarBarActor in WebAssembly

[aji (A Kumar)]

@Donny_Zimmerman

rgb[0] = static_cast(rgba[0] * 255.);
rgb[1] = static_cast(rgba[1] * 255.);
rgb[2] = static_cast(rgba[2] * 255.);

Thanks a lot. It worked. However in your code at some places static cast syntax is incorrect.