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Miloslav Ciz 2023-06-01 11:06:38 +02:00
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@ -128,7 +128,7 @@ The basic philosophy is:
- In your `S3L_PIXEL_FUNCTION` **use a per-triangle cache!** This saves a lot of CPU time. Basically make sure you don't compute per-triangle values per-pixel, but only once, with the first pixel of the triangle. You can do this by remembering the last `triangleID` and only recompute the value when the ID changes. See the examples for how this is done.
- Some things, such as screen resolution, can be specified as static (compile time, can't change during run time) or dynamic. If you can, prefer setting them to static and a power of two (e.g. `#define S3L_RESOLUTION_X 512`) to increase performance!
- Seeing buggy triangles flashing in front of the camera? With the limited 32bit arithmetic far-away things may be overflowing. Defining `S3L_USE_WIDER_TYPES` to `1` will likely help. Besides this you can try to scale down the scene. If you also don't mind it, set `S3L_STRICT_NEAR_CULLING` to `1`. With a bit of work you can implement big scene rendering even without wider types by multipass rendering (first render the far away scene scaled down, then clear z-buffer and render the near part of the scene over it).
- Seeing triangles weirdly deform in front of the camera? Due to the lack of proper near plane culling one of the options (`S3L_STRICT_NEAR_CULLING == 0`) deals with this by pushing the vertices in front of the near plane. To fix this either manually subdivide your model into more triangles or turn on `S3L_STRICT_NEAR_CULLING` (which will however make the close triangles disappear).
- Seeing triangles weirdly deform in front of the camera? See `S3L_STRICT_NEAR_CULLING == 0`, you may set it to correctly handle near plane culling for a cost of some performance, or you may try different things like subdividing your model to more triangles which may reduce the negative effect.
- Seeing triangles disappear randomly in sorted modes? This is because the size of the memory for triangle sorting is limited by default -- increase `S3L_MAX_TRIANGLES_DRAWN`.
- Sorted mode sorts triangles before drawing, but sometimes you need to control the drawing order more precisely. This can be done by reordering the objects in the scene list or rendering the scene multiple times without clearing the screen.