Aliasing for 3D modeler
Author
Hi,
I am programming a 3D modeler (http://www.macrocosm.0rg.fr), and I meet a little problem with rendering the edges. I render them with :
DrawIndexedPrimitive(D3DPT_LINELIST , 0, 0, NVertex, 0, NEdgeSelected);
The lines are very aliased... look at the following picture :
http://www.macrocosm.0rg.fr/aliasing.png
I have to say that I use the same vertex buffer for rendering faces, vertex and edges.
Do you have an idea about how I could do to make edges cleaner ? Like on the following picture (from 3DSmax) :
http://www.macrocosm.0rg.fr/max.png
Thanks !
It looks like the faces are partially overlapping the lines, due to Z-fighting. To fix this, you can use the DepthBias render state to artificially push the lines "forward" a little bit (although they'll appear in the same place on the screen.)
Author
It seems that depth bias do not affect the lines... here is an extract of the DXSDK documentation :
"The bias is not applied to any line and point primitive. However, this bias needs to be applied to triangles drawn in wireframe mode."
:(
"The bias is not applied to any line and point primitive. However, this bias needs to be applied to triangles drawn in wireframe mode."
:(
Right. So all you need to do is draw the triangles in wireframe mode, and the bias will be applied. (alternatively, you could just bias the faces backwards.)
Author
Yes, but I do not want to draw triangles, I want to draw the edges around a polygon : they may have more than 3 sides...
When they say "triangles" they mean "polygons of any number of sides". Polygons, you see, are drawn by DirectX as a series of coplanar triangles.
Author
I found a simple solution !
I just move a bit the edges in direction of the camera, with the world matrix.
I just move a bit the edges in direction of the camera, with the world matrix.
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