IC Python API:Transform Math
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Revision as of 23:31, 17 February 2020 by Chuck (RL) (Talk | contribs)
Contents
- Main article: RL Python Samples.
This article will go some recipes for common 3D transformational math. You'll find this helpful if you need to perform spacial calculations.
Transform Point
Transforms position of a point from local-space to world-space. The returned position is affected by scale.
def transform_point(world_transform, local_position):
# Get the transform matrix4
world_matrix = world_transform.Matrix()
# New matrix4 for the local position
point_world_matrix = RLPy.RMatrix4()
point_world_matrix.MakeIdentity()
point_world_matrix.SetTranslate(local_position)
# Combine the 2 matrix4s
point_world_matrix = point_world_matrix * world_matrix
# Return the translation element of the combined matrix4
return RLPy.RVector3(point_world_matrix.GetTranslate())
In order to specify the rotation in world-space, use the following instead:
def transform_point(world_transform, specific_rotation, local_position):
# Get the transform matrix4
world_matrix = world_transform.Matrix()
world_matrix.SetSR(specific_rotation)
# New matrix4 for the local position
point_world_matrix = RLPy.RMatrix4()
point_world_matrix.MakeIdentity()
point_world_matrix.SetTranslate(local_position)
# Combine the 2 matrix4
point_world_matrix = point_world_matrix * world_matrix
# Return the translation element of the combined matrix4
return RLPy.RVector3(point_world_matrix.GetTranslate())
Transform Direction
Transforms direction of a vector from local-space to world-space. The returned vector has the same length as the direction.
def transform_direction(world_transform, local_position):
# Get the transform rotation 3x3 matrix
world_rot_matrix = world_transform.Rotate()
# New matrix4 for world direction
world_dir = RLPy.RMatrix4()
world_dir.MakeIdentity()
world_dir.SetSR(world_rot_matrix)
# New matrix for the local position
point_world_matrix = RLPy.RMatrix4()
point_world_matrix.MakeIdentity()
point_world_matrix.SetTranslate(local_position)
# Combine the 2 matrix4
point_world_matrix = point_world_matrix * world_dir
# Return the translation element of the combined matrix4
return RLPy.RVector3(point_world_matrix.GetTranslate())