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I have a set of 3 vectors defined by vertices:

  1. Vector1 - (x0, y0, z0), (x1, y1, z1)
  2. Vector2 - (x0, y0, z0), (x2, y2, z2)
  3. Vector3 - (x0, y0, z0), (x3, y3, z3)

I want to create a rotation matrix from these vectors, which when applied on any other vector V, would align V with the new matrix world.

enter image description here

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2 Answers 2

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Assuming that you actually have the 4 vectors in your diagram:

  • V0 - (x0, y0, z0) being the new pivot/world center of your matrix.
  • V1 - (x1, y1, z1) being the X axis.
  • V2 - (x2, y2, z2) being the Y axis.
  • V3 - (x3, y3, z3) being the Z axis.

And that they're all in the parents space of the given vector, your direction vectors (V1, V2, V3) should be realigned to your new world center:

V1 -= V0
V2 -= V0
V3 -= V0

And your new matrix can be constructed with the following function:

Matrix([(x1, y1, z1, x0),
        (x2, y2, z2, y0),
        (x3, y3, z3, z0),
        ( 0,  0,  0,  1)]
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Here's what worked for me:

# First create the matrix having Z axis aligned to V3
rotmat = V3.to_track_quat().to_matrix()

# Find the rotation diff of X axis of this and V1 (the new X axis)
matX = rotmat @ Vector((1, 0, 0))
rotDiff = matX.rotation_difference(V1)

# rotate the matrix with this difference
rotmat = rotDiff.to_matrix() @ rotmat

# We don't need V2
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