Separate arrays convention for storing triangle meshes ↩

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created: 2022-02-26 18:39:07
modified: 2022-02-26 18:49:08

This is just a simple way of storing the vertices and indices of a mesh in memory: store the , , coordinates in separate arrays and also put the indices corresponding to the corners of triangles in separate arrays.

This means the following exact configuration:

A separate array, x, storing the coordinates of vertices
A separate array, y, storing the coordinates of vertices in the same order
A separate array, z, storing the coordinates of vertices in the same order
A separate array, i, storing the index of the first vertex for each triangle
A separate array, j, storing the index of the second vertex for each triangle in the same order
A separate array, k, storing the index of the third/last vertex for each triangle in the same order

Example: tetrahedron

With this convention, a tetrahedron would be stored the following way (using Python syntax):

x=[0, 1, 2, 0]
y=[0, 0, 1, 2]
z=[0, 2, 0, 1]

i=[0, 0, 0, 1]
j=[1, 2, 3, 2]
k=[2, 3, 1, 3]

This results in the following, when rendered (see this):