Hello there,
I´ve got a problem with my heightmaps.
I am trying to use a bumpmap from the celestia motherlode to cover a realistically scaled Mars.
My problem is not the spherical projection, I did that by using the bumpmap as displacement image, it works.
But even the biggest bumpmap I could find has one-pixel artifacts that appear as kilometer-sized bumps on my surface.
Could get rid of those by using a "selective gaussian blur" in gimp.
Biggest problem that remains is that -even without this blur- steep features like parts of the valles marineris system appear as rather flat slopes because even a steep grayscale gradient in the map represents some distance on planetary scale.
Has anybody any Idea how to solve this without painting it pixelwise by hand?
Best regards,
Jan