POV-Ray has problems using incomplete png images (like generated with
partial/interrupted renders) in image maps, heightfields, etc.

It reports:

Parse Error: Cannot read PNG image.

Observed with WinPOV 3.5, K6/500, WinNT 4

The reason is that it uses the 'png_read_image()' function from libpng. 
Reading the image line by line with 'png_read_row()' like it is done for
continuing an interrupted trace (renderio.cpp, function
'Read_Rendered_Part()') should solve the problem.

Christoph

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