Jagged edges where meshes intersect (not anti-aliasing issue)

I’m making a super low-poly map.

  • The ground is an image imported as a plane.
  • The buildings are cubes with 2 materials applied.

The buildings should sit ON the map, but when I do that, I get these jagged edges. Not only in the rendered image, but in the 3D preview window.

(I JUST updated to Blender 2.74 – but I just reviewed in BL2.73 and the same issue is occurring)

You’re looking at maybe 40 polygons at the max here.


The underlying map is a PNG file, no alpha. I’ve never had the problem before, and I’ve done a ton of crappy animations like this, never seen this odd quavering where simple edges intersect.

I’ve got two (very very short) videos too - one with shadows, one without.

Help! Help me please!

I’ve done some testing. The issue doesn’t happen on a new file, nor a file where I import that map image and recreate the issue. So it must be some oddball setting or duplicate overlapping thing I’ve done. I have no clue.

I’m rebuilding the mess from scratch. But if anybody sees this post and recognizes what the issue is, I’d love to find out. Thanks.

It may or may not be a floating point precision issue (can happen if the scene’s scale is too large or too small).

You might want to increase the camera clip start distance for both the viewport and for rendering and see if that helps (or decrease the clip end value if the scene scale is small).

Thanks for the reply - I have no idea what I did. It was the nudge I needed to go back and rebuild the entire scene again, correctly.