Rendered imaged has weird shadows

Question

I've got a sphere with a texture and a material and I'm using blender render. This is how it looks in material view.

[ enter image description here ]

And this is how the rendered image looks.

[ enter image description here ]

What am I doing wrong?

Heres my .blend file : http://www.mediafire.com/download/gly7535pswrnryj/problem.blend

Note : Im posting the blend file because I've got an integrated graphics card and I've heard blender has got some issues with these. So maybe it works for you, and its just my computer.

@VinnieH01 I just inspected your .blend - you have 2 meshes (spheres) on top of each other. One textured and one pink. It is the same problem as in the duplicate. — Jaroslav Jerryno Novotny, Jul 23 '15 at 13:19
I don't think this should be marked as a duplicate just because it's a Z-fighting problem. The circumstances leading up to the Z-fighting appear to be different. — , Jul 24 '15 at 13:47

score 1 · Accepted Answer · answered Jul 23 '15 at 13:35

There are 2 spheres on top of each other - one textured, one pink.

To move them apart select 1 vertex in edit-mode and then select all connected to it with CtrlL. This will select only 1 sphere so they can be separated.

You can also hide selected with H and unhide with AltH so you don't have to move the mesh.

Delete the one you don't want(pink probably).

The 2 spheres were there probably because it was a game-engine model with single-sided polygons - so the textured sphere was for outside and the pink for inside surface. The renderer will render surface from both sides and they are z-fighting.

score 1 · Answer 2 · answered Jul 23 '15 at 13:36

Found your problem. You created multiple overlapping spheres in edit mode, so it looks like one object but it has the geometry of many spheres.

Try to delete a face and you'll notice you have to do it around 4 times before it actually disappears from the sphere.

The artefact is due to Z-fighting.

Rendered imaged has weird shadows

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