Wire lines do not always correctly display when rendered. The attached file displays this better.
In the attached file there is a single mesh with two materials. The world has a black sky. One material is Halo of black color. The other material is a green Wire which emits light. There are no lamps. The resulting affect is glowing green outline of the edges of the mesh. The mesh is not transparent.
The bug is that the edges do not always display. In the blender file, the mesh is symetrical and the camera is centered. However only the lines on the top and right display when the scene is rendered.
Changing camera clipping does not affect the output.
Attached are the expected results, the actual results and the file which displays the bug.
I was able to reproduce this bug on
Windows 7 64 bit running Blender 2.65 r53189 (attached blend file was generated with this version)
Linux (Fedora 17) 64 bit Blender 2.64~ (compiled)
Linux (Fedora 16) 32 bit Blender 2.63~ (compiled)
Description
Event Timeline
Message:
Select all faces (all vertices) and press "Assign" for the green wire material.
You cannot have both wire and halo mixed on the same mesh... the selected face propagates properties from it to edges or vertices to define what renders.
Both materials were added by selecting all vertices and pressing Assign
I dissagree that this is not a bug for the following reasons:
The error still persists regardless if the second material is of type Volume or Surface (instead of Halo)
The end rendered result is gibberish
You are also saying that there is no way to easily make this effect --- is it preferable to have meaningless gibberish than a symmetrical result ??
In Blender every face can only have 1 material. On rendering, edges and vertices look up which face they belong to for picking halo or wire options. If you want to combine wire render and halos, duplicate the mesh and things go all fine.
It's just how it works, with limited functionality but very easy to use. Improvements here can be studied on, but that's not for the bug tracker to worry about.