basic advanced example

tools/smoke_reverse_walk.py

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+"""Reverse a walking clip and replace baked travel with an explicit retreat."""
+import math
+
+from ue_workshop import Scene, Sequence
+from ue_workshop.animations import CreatureAnimations as C
+from ue_workshop.characters import CREATURE_MODEL
+
+scene = Scene("ReverseWalkingSmoke")
+creature = scene.skeletal_model(CREATURE_MODEL, name="Creature", height=300, location=(0, -850, 0))
+shot = Sequence(scene, fps=30, frames=180)
+shot.animation(creature, C.MUTANT_RUN, start=0, end=60, keep_end_position=True)
+shot.animation(creature, C.MUTANT_SWIPING, start=20)
+walk = shot.animation(creature, C.MUTANT_WALKING, start=80, end=120,
+                       keep_end_position=True, reverse=True)
+assert walk.get_editor_property("params").get_editor_property("reverse")
+before = shot.position(creature, 80)
+natural_end = shot.position(creature, 120)
+assert natural_end[1] < before[1] - 10, (before, natural_end)
+# A later authored key should retain its relative movement after replacement.
+shot.transform_key(creature, 150, location=(natural_end[0], natural_end[1] + 30, natural_end[2]))
+target = shot.move(creature, start=80, end=120, offset=(0, -200, 0))
+assert math.dist(shot.position(creature, 80), before) < 0.001
+assert math.dist(shot.position(creature, 120), target) < 0.001
+assert abs(target[1] - before[1] + 200) < 0.001
+middle = shot.position(creature, 100)
+assert target[1] < middle[1] < before[1], middle
+assert abs(shot.position(creature, 150)[1] - target[1] - 30) < 0.001
+channels = shot._transforms[creature.get_path_name()]
+assert all(not 80 < key.get_time().frame_number.value < 120 for key in channels[1].get_keys())
+shot.save(open_editor=False)