anim: GPU skinning

[kikonen]

Steps

1. Calculate animation & anim blending in CPU and generate bone palette matrices
2. In compute shader pre-transform all vertices for skinned meshes with bone matrices

=> Theorem is that this reduces needed calculations, especially since, every mesh need to be drawn from multiple different camera viewpoints for every frame, upto 45 times.

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Trivia: When single scene is drawn, full scene is drawn basically 45 times

• cube map 6 sides
  • water x2/mirror/normal per side
  • nested water x2 for mirror
  • thus 6 per side
  • => 36 total
• mirror
  • reflection
  • nested water x2 for mirror
  • => 3 total
• water
  • 2x times (reflection/refraction)
  • => 2 total
• shadow map
  • 3 casdades
  • => 3 total
• normal scene
  • => 1 total

Thus approximately 45 times per frame. However, cheating, thus not drawing everything on every frame. But still 20+ times per frame averages

=> However, this means also that mesh vertices must be multiplied per for every animated mesh, to store pre-calculated verticies. Overhead of this is potentially eating away benefits for big meshes with thousands of vertices