[ADD] Several additions to the basic volume rendering functionality.
* First, the volume rendering now takes a hand-designed texture from the transferFunction1D module as additional input * Second, it has a maximum intensity projection (MIP) mode that determines the maximum value based on the alpha value of the transfer function and paints the color as it would have been determined by the defined shading * Third, if MIP is enabled, depth projection can be chosen to color the maximum intensity along the ray by the (approximated) distance to the viewer. The color is taken from the given color texture.
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