How to access to a float4 position?

[caroline]

Also, if you just want to make a cylinder, you can use Metal’s built in primitive described here:

MDLMesh cylinder explanation of parameters of constructor

[Screen Shot 2021-10-27 at 10.27.22 am] extent: the three dimensional width, height and depth. segments: is a uint2 where x is the number of segments around the cylinder, and y is the number of segments vertically. inwardNormals: do the normals face inwards (true or false). topCap: Add a cap (extra triangles) to the top of the cylinder. bottomCap: Add a cap to the bottom of the cylinder. Rendered cylinders from left to right, with the color showing the normals: extent: [1, 5, 1] se…

You could then access the vertices in the generated MTLBuffer if you need to do anything else with them.