I'm wondering how you use the 3d transform command within macros.
I want to let users set a rotation angle and then click on x, y or z icons to rotate that amount on a 3d drawing.
Problem is that macro help doesn't explain how it's used.
The syntax is just:
3D TRANSFORM 3d-matrix
and the example is:
#stretching the drawing to double size
#along the y-axis
3D TRANSFORM 1 0 0 0 0 2 0 0 0 0 1 0 0 0 0 0
I can't find any reference to this 3d-matrix - how are we to know what each number represents?
I've recorded some macros setting the Y angle rotation to 90 degrees but this hasn't helped me understand the matrix any better as it comes up with:
3D Transform 0 0 (-1) 0 0 1 0 0 1 0 0 0 0 0 0 1
No record of 90 degrees in that matrix, so I guess one of the numbers - "1" or "(-1)" must refer to the 90 degrees.
You can read the 16 values as the four rows of a 4x4 transformation matrix.
Here you can find a nice short description how to get such a matrix from rotation values:
Define beta as Float
beta = Get Float "Rotation angle around y "
3D Transform \
cos(beta) 0 sin(beta) 0 \
0 1 0 0 \
(-sin(beta)) 0 cos(beta) 0 \
0 0 0 1
Thanks for that.
I won't pretend to understand it, but at least it explains that the numbers all represent something and I'll work on your example - much appreciated.