Added support for Warm Up Period to also work on motor constraints

Also fixed rigid body cache start frame number not being updated from Blender timeline.

Author: KaiKostack

kk_bullet_constraints_builder.zip

@@ -72,6 +72,7 @@ def initGeneralRigidBodyWorldSettings(scene):
     scene.rigidbody_world.steps_per_second = props.stepsPerSecond
     scene.rigidbody_world.solver_iterations = props.solverIterations
     # Set the length of the point cache to match the scene length
+    scene.rigidbody_world.point_cache.frame_start = scene.frame_start
     scene.rigidbody_world.point_cache.frame_end = scene.frame_end
     # Set Split Impulse for rigid body simulation
     #scene.rigidbody_world.use_split_impulse = True

kk_bullet_constraints_builder/builder_prep.py

@@ -149,6 +149,9 @@ def monitor_eventHandler(scene):
             if props.progrWeakStartFact != 1:
                 monitor_progressiveWeakening(scene, props.progrWeakStartFact)
 
+            ### Motor constraint warm up period
+            monitor_motorWarmUp(scene)
+
             ### Displacement correction initialization
             monitor_displCorrectDiffExport(scene)
 
@@ -207,6 +210,10 @@ def monitor_eventHandler(scene):
                     ###### Function
                     monitor_fixSprings(scene)
 
+            ### Motor constraint warm up period
+            if scene.frame_current < scene.frame_start +props.warmUpPeriod:
+                monitor_motorWarmUp(scene)
+
             ### Displacement correction vertex location differences export
             if scene.frame_current == scene.frame_start +props.warmUpPeriod:
                 monitor_displCorrectDiffExport(scene)
@@ -241,6 +248,9 @@ def monitor_eventHandler(scene):
             if props.progrWeakStartFact != 1:
                 monitor_progressiveWeakening_fm(scene, props.progrWeakStartFact)
 
+            ### Motor constraint warm up period
+            monitor_motorWarmUp_fm(scene)
+
             ### Displacement correction initialization
             monitor_displCorrectDiffExport(scene)
 
@@ -294,6 +304,10 @@ def monitor_eventHandler(scene):
                     ###### Function
                     monitor_fixSprings_fm(scene)
 
+            ### Motor constraint warm up period
+            if scene.frame_current < scene.frame_start +props.warmUpPeriod:
+                monitor_motorWarmUp_fm(scene)
+
             ### Displacement correction vertex location differences export
             if scene.frame_current == scene.frame_start +props.warmUpPeriod:
                 monitor_displCorrectDiffExport(scene)
@@ -1288,6 +1302,61 @@ def monitor_progressiveWeakening_fm(scene, progrWeakVar):
 
 ################################################################################
 
+def monitor_motorWarmUp(scene):
+
+    if debug: print("Calling motorWarmUp")
+
+    props = bpy.context.window_manager.bcb
+
+    # Find motor constraints (not BCB generated)
+    try: emptyObjs = bpy.data.groups["RigidBodyConstraints"].objects
+    except: emptyObjs = []
+    emptyObjs = [obj for obj in emptyObjs if obj.type == 'EMPTY' and not obj.hide and obj.is_visible(bpy.context.scene) and obj.rigid_body_constraint != None]
+
+    if scene.frame_current == scene.frame_start:
+        factor = 1 /props.warmUpPeriod
+    else:
+        factor = 1 /(scene.frame_current -scene.frame_start) +1
+
+    for objConst in emptyObjs:
+        const = objConst.rigid_body_constraint
+        if const.type == 'MOTOR' and const.enabled:
+            if const.use_motor_lin:
+                const.motor_lin_target_velocity *= factor
+                const.motor_lin_max_impulse *= factor
+            if const.use_motor_ang:
+                const.motor_ang_target_velocity *= factor
+                const.motor_ang_max_impulse *= factor
+            
+########################################
+
+def monitor_motorWarmUp_fm(scene):
+
+    if debug: print("Calling motorWarmUp_fm")
+
+    props = bpy.context.window_manager.bcb
+
+    # Get Fracture Modifier
+    try: ob = scene.objects[asciiExportName]
+    except: print("Error: Fracture Modifier object expected but not found."); return
+    md = ob.modifiers["Fracture"]
+
+    if scene.frame_current == scene.frame_start:
+        factor = 1 /props.warmUpPeriod
+    else:
+        factor = 1 /(scene.frame_current -scene.frame_start) +1
+    
+    for const in md.mesh_constraints:
+        if const.type == 'MOTOR' and const.enabled:
+            if const.use_motor_lin:
+                const.motor_lin_target_velocity *= factor
+                const.motor_lin_max_impulse *= factor
+            if const.use_motor_ang:
+                const.motor_ang_target_velocity *= factor
+                const.motor_ang_max_impulse *= factor
+            
+################################################################################
+
 def monitor_dampingRegion(scene):
 
     if debug: print("Calling dampingRegion")