Difference between revisions of "Optimising geometry"
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| − | * Backfaces are bad, because they waste renderer cycles and risk creating glitches where a face shows over a face it should be behind. If you're building your model using geometric primitives, be sure to remove all the internal faces where possible. In Blender 'local view' or use of layers help immensely. | + | This page needs vetting by someone who understands rendering. Believe it at your peril. |
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| + | * Backfaces are bad, because they waste renderer cycles and risk creating glitches where a face shows over a face it should be behind. If you're building your model using geometric primitives, be sure to remove all the internal faces where possible. In Blender 'local view' or use of layers help immensely. Set your objects to single sided. | ||
* That said, there is a balance between culling backfaces and overcomplicating the geometry. Too many triangles strains the renderer. If you've got a small mesh intersecting a face, cutting the face up to meet the mesh introduces extra triangles, and is a judgement call. | * That said, there is a balance between culling backfaces and overcomplicating the geometry. Too many triangles strains the renderer. If you've got a small mesh intersecting a face, cutting the face up to meet the mesh introduces extra triangles, and is a judgement call. | ||
* All faces are triangles as far as the engine is concerned. A more complex face is reduced to triangles. | * All faces are triangles as far as the engine is concerned. A more complex face is reduced to triangles. | ||
* Vertices and edges don't matter as such. If you create three vertices, create edges between them, divide those edges into parts then create a triangle between the original three vertices you still have a triangle. In Blender, when you select a face the delineating vertices will be highlighted - if there are three of them, it's a triangle :-) | * Vertices and edges don't matter as such. If you create three vertices, create edges between them, divide those edges into parts then create a triangle between the original three vertices you still have a triangle. In Blender, when you select a face the delineating vertices will be highlighted - if there are three of them, it's a triangle :-) | ||
* Removing double vertices helps to get rid of extra faces | * Removing double vertices helps to get rid of extra faces | ||
Revision as of 00:13, 28 January 2013
This page needs vetting by someone who understands rendering. Believe it at your peril.
- Backfaces are bad, because they waste renderer cycles and risk creating glitches where a face shows over a face it should be behind. If you're building your model using geometric primitives, be sure to remove all the internal faces where possible. In Blender 'local view' or use of layers help immensely. Set your objects to single sided.
- That said, there is a balance between culling backfaces and overcomplicating the geometry. Too many triangles strains the renderer. If you've got a small mesh intersecting a face, cutting the face up to meet the mesh introduces extra triangles, and is a judgement call.
- All faces are triangles as far as the engine is concerned. A more complex face is reduced to triangles.
- Vertices and edges don't matter as such. If you create three vertices, create edges between them, divide those edges into parts then create a triangle between the original three vertices you still have a triangle. In Blender, when you select a face the delineating vertices will be highlighted - if there are three of them, it's a triangle :-)
- Removing double vertices helps to get rid of extra faces
