Get maximum amount of vertices used by skeleton

megavlad

Is there a way to figure out the maximum amount of vertices that a Spine skeleton/animation requires for drawing the frame with the most amount of vertices?

When loading the Spine data, I'd like to create a vertex buffer once and associate it with the skeleton so that I don't have to keep uploading vertex data during the animation. Then, each frame, I would modify the range of vertices need for that particular frame, knowing that there are enough vertices for any possible frame of animation.

Mario

You can iterate through all attachments in a skin and count the vertices and indices of each. For RegionAttachment, the vertex count is 4 and the index count is 6 (triangle list). For MeshAttachment, you can find the number of vertices via MeshAttachment::getWorldVerticesLength() and divide it by 2. The index count is given via MeshAttachment::getTriangles()::size().

That will give you a good approximation of the maximally possible number of vertices and indices. However, if you plan on batching across skeletons, I'd suggest you write a sprite batcher that will automatically grow the vertex buffer.