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mongoose54
Member
Hi,
I am new to Cocos3D and I want to ask you if it Is possible to animate the vertices of a body through a custom function? Basically I have a plane (x by y dimension) and I want to deform it using a specific formula: z = f(x,y) . Does Cocos3d support this? Thanks in advance!
Yes, you can manipulate individual vertices using the vertexLocationAt: / setVertexLocation:at: family of accessor methods.
There are also related method for other vertex content such as normals, colors and texture coordinates.
…Bill
mongoose54
Member
Thanks for the quick reply Bill! Great work.
Just a very quick question regarding the setVertexLocation:at: method:
I have the plane
CC3MeshNode * plane = [CC3PlaneNode nodeWithName: kGroundName];
[plane populateAsCenteredTexturedRectangleWithSize: CGSizeMake(400,400.0) andTessellation: ccg(20, 20)];later on I deform the plane using setVertexLocation:at: as you suggested . The question is how can I make a copy of the original mesh (variable: plane) so that I can access the original values later on.
Thanks a lot BIll.
Probably the simplest way would be to copy the CC3VertexLocations instance using the copy or copyAutoreleased method. This will copy the underlying data.
To access this from a mesh node, you need to cast the mesh property into a CC3VertexArrayMesh, and then access the vertexLocations property: ((CC3VertexArrayMesh*)myNode.mesh).vertexLocations.
By design, when you copy a node, or even the underlying mesh instance, the vertex arrays are NOT copied automatically, in order to avoid replicating large chunks of static mesh data.
...Bill
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