Blender Git Loki

Functions: use better conversion from float2 to float3

Previously float2 was converted to float3 by implicitly converting to a
float pointer first, which was then passed to the float3 constructor.
This leads to uninitialized memory in the z component of the new float3.

Ideally this should be solved in float2/float3 itself, but my first fix for
that resulted in a compile error: rB6ac0a3d83c8e5a39bd5356aa0d68e3166bd91e82

This is an alternative fix that can be used for now. Will have to look
into the conversion in more detail again.