Convert matrix_float4x4 to x y z space
A good way to figure this out is to learn about 4x4 matrices as they are really the basis for all 3D visualization and mathematics.
- To get the position from a 4x4 matrix use the entries m41, m42, m43.
- To get the rotation use the 3x3 matrix in m11 ... m33.
Some resources to get you started:
- Brush up on that linear algebra first in 2D, then 3D: I like http://blog.wolfire.com/2009/07/linear-algebra-for-game-developers-part-1/
- Or if the game programming stuff turns you off: https://betterexplained.com/articles/linear-algebra-guide/
- Then straight to GL: http://www.opengl-tutorial.org/beginners-tutorials/tutorial-3-matrices/
I'm using matrix_float4x4 extension for that:
extension matrix_float4x4 {
func position() -> SCNVector3 {
return SCNVector3(columns.3.x, columns.3.y, columns.3.z)
}
}
Using:
let position = transform.position()
Or you can convert position directly in code:
let position = SCNVector3(
transform.columns.3.x,
transform.columns.3.y,
transform.columns.3.z
)