blender/release/scripts/startup/bl_operators/rigidbody.py

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# <pep8-80 compliant>

import bpy
from bpy.types import Operator
from bpy.props import IntProperty
from bpy.props import EnumProperty


class CopyRigidbodySettings(Operator):
    '''Copy Rigid Body settings from active object to selected'''
    bl_idname = "rigidbody.object_settings_copy"
    bl_label = "Copy Rigidbody Settings"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        return (obj and obj.rigid_body)

    def execute(self, context):
        obj = context.object
        scn = context.scene

        # deselect all but mesh objects
        for o in context.selected_objects:
            if o.type != 'MESH':
                o.select = False

        sel = context.selected_objects
        if sel:
            # add selected objects to active one groups and recalculate
            bpy.ops.group.objects_add_active()
            scn.frame_set(scn.frame_current)

            # copy settings
            for o in sel:
                if o.rigid_body is None:
                    continue
                
                o.rigid_body.type = obj.rigid_body.type
                o.rigid_body.kinematic = obj.rigid_body.kinematic
                o.rigid_body.mass = obj.rigid_body.mass
                o.rigid_body.collision_shape = obj.rigid_body.collision_shape
                o.rigid_body.use_margin = obj.rigid_body.use_margin
                o.rigid_body.collision_margin = obj.rigid_body.collision_margin
                o.rigid_body.friction = obj.rigid_body.friction
                o.rigid_body.restitution = obj.rigid_body.restitution
                o.rigid_body.use_deactivation = obj.rigid_body.use_deactivation
                o.rigid_body.start_deactivated = obj.rigid_body.start_deactivated
                o.rigid_body.deactivate_linear_velocity = obj.rigid_body.deactivate_linear_velocity
                o.rigid_body.deactivate_angular_velocity = obj.rigid_body.deactivate_angular_velocity
                o.rigid_body.linear_damping = obj.rigid_body.linear_damping
                o.rigid_body.angular_damping = obj.rigid_body.angular_damping
                o.rigid_body.collision_groups = obj.rigid_body.collision_groups

        return {'FINISHED'}


class BakeToKeyframes(Operator):
    '''Bake rigid body transformations of selected objects to keyframes'''
    bl_idname = "rigidbody.bake_to_keyframes"
    bl_label = "Bake To Keyframes"
    bl_options = {'REGISTER', 'UNDO'}

    frame_start = IntProperty(
            name="Start Frame",
            description="Start frame for baking",
            min=0, max=300000,
            default=1,
            )
    frame_end = IntProperty(
            name="End Frame",
            description="End frame for baking",
            min=1, max=300000,
            default=250,
            )
    step = IntProperty(
            name="Frame Step",
            description="Frame Step",
            min=1, max=120,
            default=1,
            )

    @classmethod
    def poll(cls, context):
        obj = context.object
        return (obj and obj.rigid_body)

    def execute(self, context):
        bake = []
        objs = []
        scene = context.scene
        frame_orig = scene.frame_current
        frames = list(range(self.frame_start, self.frame_end + 1, self.step))

        # filter objects selection
        for obj in context.selected_objects:
            if not obj.rigid_body or obj.rigid_body.type != 'ACTIVE':
                obj.select = False

        objs = context.selected_objects

        if objs:
            # store transformation data
            for f in list(range(self.frame_start, self.frame_end + 1)):
                scene.frame_set(f)
                if f in frames:
                    mat = {}
                    for i, obj in enumerate(objs):
                        mat[i] = obj.matrix_world.copy()
                    bake.append(mat)

            # apply transformations as keyframes
            for i, f in enumerate(frames):
                scene.frame_set(f)
                obj_prev = objs[0]
                for j, obj in enumerate(objs):
                    mat = bake[i][j]

                    obj.location = mat.to_translation()

                    rot_mode = obj.rotation_mode
                    if rot_mode == 'QUATERNION':
                        obj.rotation_quaternion = mat.to_quaternion()
                    elif rot_mode == 'AXIS_ANGLE':
                        # this is a little roundabout but there's no better way right now
                        aa = mat.to_quaternion().to_axis_angle()
                        obj.rotation_axis_angle = (aa[1], ) + aa[0][:]
                    else: # euler
                        # make sure euler rotation is compatible to previous frame
                        obj.rotation_euler = mat.to_euler(rot_mode, obj_prev.rotation_euler)

                    obj_prev = obj

                bpy.ops.anim.keyframe_insert(type='BUILTIN_KSI_LocRot', confirm_success=False)

            # remove baked objects from simulation
            bpy.ops.rigidbody.objects_remove()

            # clean up keyframes
            for obj in objs:
                action = obj.animation_data.action
                for fcu in action.fcurves:
                    keyframe_points = fcu.keyframe_points
                    i = 1
                    # remove unneeded keyframes
                    while i < len(keyframe_points) - 1:
                        val_prev = keyframe_points[i - 1].co[1]
                        val_next = keyframe_points[i + 1].co[1]
                        val = keyframe_points[i].co[1]

                        if abs(val - val_prev) + abs(val - val_next) < 0.0001:
                            keyframe_points.remove(keyframe_points[i])
                        else:
                            i += 1
                    # use linear interpolation for better visual results
                    for keyframe in keyframe_points:
                        keyframe.interpolation = 'LINEAR'

            # return to the frame we started on
            scene.frame_set(frame_orig)

        return {'FINISHED'}

    def invoke(self, context, event):
        scene = context.scene
        self.frame_start = scene.frame_start
        self.frame_end = scene.frame_end

        wm = context.window_manager
        return wm.invoke_props_dialog(self)


class ConnectRigidBodies(Operator):


    '''Connect selected rigid bodies to active'''
    bl_idname = "rigidbody.connect"
    bl_label = "ConnectRigidBodies"
    bl_options = {'REGISTER', 'UNDO'}

    con_type = EnumProperty(
        name="Type",
        description="Type of generated contraint",
        items=(('FIXED', "Fixed", "Glues ridig bodies together"),
               ('POINT', "Point", "Constrains rigid bodies to move aound common pivot point"),
               ('HINGE', "Hinge", "Restricts rigid body rotation to one axis"),
               ('SLIDER', "Slider", "Restricts rigid boddy translation to one axis"),
               ('PISTON', "Piston", "Restricts rigid boddy translation and rotation to one axis"),
               ('GENERIC', "Generic", "Restricts translation and rotation to specified axes"),
               ('GENERIC_SPRING', "Generic Spring", "Restricts translation and rotation to specified axes with springs")),
        default='FIXED',)

    pivot_type = EnumProperty(
        name="Location",
        description="Constraint pivot location",
        items=(('CENTER', "Center", "Pivot location is between the constrained rigid bodies"),
               ('ACTIVE', "Active", "Pivot location is at the active object position"),
               ('SELECTED', "Selected", "Pivot location is at the slected object position")),
        default='CENTER',)

    @classmethod
    def poll(cls, context):
        obj = context.object
        objs = context.selected_objects
        return (obj and obj.rigid_body and (len(objs) > 1))

    def execute(self, context):

        objs = context.selected_objects
        obj_act = context.active_object

        for obj in objs:
            if obj == obj_act:
                continue
            if self.pivot_type == 'ACTIVE':
                loc = obj_act.location
            elif self.pivot_type == 'SELECTED':
                loc = obj.location
            else:
                loc = (obj_act.location + obj.location) / 2.0
            bpy.ops.object.add(type='EMPTY', view_align=False, enter_editmode=False, location=loc)
            bpy.ops.rigidbody.constraint_add()
            con = context.active_object.rigid_body_constraint
            con.type = self.con_type
            con.object1 = obj_act
            con.object2 = obj

        return {'FINISHED'}

    def invoke(self, context, event):
        wm = context.window_manager
        return wm.invoke_props_dialog(self)