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| 2D Skeletal Animation with OpenGL |
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Archon
Member #4,195
January 2004
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I'm wanting to make a flat (virtually 2D) object move about the screen but employ skeletal animation using textured quads for each body part... What would be the best way to do this? A simple vertex mesh (like MD3)? Secondly, what's the recommended way (and any other way) to rotate the vertices and have the child vertices swing around with their parents? |
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Matt Smith
Member #783
November 2000
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In GL, you generally use glRotatef() on the MODEL_VIEW matrix to do joints e.g.
transform skeleton parent (object) position
draw torso vertices
pushmatrix
rotate shoulder joint
draw upper arm vertices
pushmatrix
rotate elbow joint
draw lower arm vertices
popmatrix
popmatrix // returns to parent
pushmatrix etc... repeat for other limbs
That's the basic idea, but I've missed out things like translating to the pivot (I'm not sure at this moment whether this goes inside or outside the pushmatrix), and drawing polys that are stretched between two different rotation sets |
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Archon
Member #4,195
January 2004
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Quote: I've missed out things like translating to the pivot Yes -- I think that this is the main problem that I have... [edit] I don't know what you mean by "drawing polys that are stretched between two different rotation sets" though. |
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Matt Smith
Member #783
November 2000
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If the vertices are all relative to their immediate parent joint, then you should be OK. This effectively means that each movable part will be a separate mesh. The stretched polys are ones that have some vertices in one part, and others in another. In a 3d mesh like md3 these would be the ones around the joints. It sounds like you won't have this problem if your meshes are like paper cut-outs |
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Archon
Member #4,195
January 2004
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OK, from this: Quote: If the vertices are all relative to their immediate parent joint I've started something using that idea. The file will save their global points but I'll have to offset them when I load them. |
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Mr. Big
Member #6,196
September 2005
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Maybe this could help: |
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