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from lnx.logicnode.lnx_nodes import *
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class AddPhysicsConstraintNode(LnxLogicTreeNode):
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"""
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Add a physics constraint to constrain two rigid bodies if not already present.
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@option Fixed: No fredom of movement. Relative positions and rotations of rigid bodies are fixed
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@option Point: Both rigid bodies are constrained at the pivot object.
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@option Hinge: Constrained objects can move only along angular Z axis of the pivot object.
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@option Slider: Constrained objects can move only along linear X axis of the pivot object.
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@option Piston: Constrained objects can move only and rotate along X axis of the pivot object.
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@option GenericSpring: Fully custimizable generic 6 degree of freedom constraint with optional springs. All liner and angular axes can be constrained
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along with spring options. Use `Physics Constraint Node` to set a combination of constraints and springs.
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@seeNode Physics Constraint
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@input Pivot object: The object to which the physics constraint traint is applied. This object will not be affected by the constraint
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but is necessary to specify the constraint axes and location. Hence, the pivot object need not be a rigid body. Typically an `Empty`
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object may be used. Each pivot object can have only one constraint trait applied. Moving/rotating/parenting the pivot object after the constraint
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is applied has no effect. However, removig the pivot object removes the constraint and `RB 1` and `RB 2` are no longer constrained.
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@input RB 1: The first rigid body to be constrained. Must be a rigid body. This object can be constrained by more than one constraint.
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@input RB 2: The second rigid body to be constrained. Must be a rigid body. This object can be constrained by more than one constraint.
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@input Disable Collisions: Disable collisions between `RB 1` and `RB 2`
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@input Breakable: Constraint can break if stress on the constraint is more than the set threshold. Disable this option to disable breaking.
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@input Breaking threshold: Stress on the constraint above which the constraint breaks. Depends on the mass, velocity of rigid bodies and type of constraint.
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@input Limit Lower: Lower limit of the consraint in that particular axis
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@input Limit Upper: Upper limit of the constraint in that particular axis. (`lower limit` = `upper limit`) --> Fully constrained. (`lower limit` < `upper limit`) --> Partially constrained
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(`lower limit` > `upper limit`) --> Full freedom.
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@input Angular limits: Limits to constarin rotation. Specified in degrees. Range (-360 to +360)
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@input Add Constarint: Option to add custom constraint to `Generic Spring` type.
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"""
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bl_idname = 'LNAddPhysicsConstraintNode'
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bl_label = 'Add Physics Constraint'
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lnx_section = 'add'
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lnx_version = 1
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@staticmethod
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def get_enum_id_value(obj, prop_name, value):
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return obj.bl_rna.properties[prop_name].enum_items[value].identifier
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@staticmethod
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def get_count_in(type_name):
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return {
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'Fixed': 0,
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'Point': 1,
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'Hinge': 2,
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'Slider': 3,
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'Piston': 4,
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'Generic Spring': 5
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}.get(type_name, 0)
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def get_enum(self):
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return self.get('property0', 0)
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def set_enum(self, value):
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# Checking the selection of another type
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select_current = self.get_enum_id_value(self, 'property0', value)
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select_prev = self.property0
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#Check if a different type is selected
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if select_prev != select_current:
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print('New value selected')
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# Arguements for type Fixed
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if (self.get_count_in(select_current) == 0):
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while (len(self.inputs) > 7):
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self.inputs.remove(self.inputs.values()[-1])
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# Arguements for type Point
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if (self.get_count_in(select_current) == 1):
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while (len(self.inputs) > 7):
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self.inputs.remove(self.inputs.values()[-1])
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#Arguements for type Hinge
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if (self.get_count_in(select_current) == 2):
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while (len(self.inputs) > 7):
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self.inputs.remove(self.inputs.values()[-1])
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#Z ang limits
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self.add_input('LnxBoolSocket', 'Z angle')
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self.add_input('LnxFloatSocket', 'Z ang lower', -45.0)
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self.add_input('LnxFloatSocket', 'Z ang upper', 45.0)
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#Arguements for type Slider
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if (self.get_count_in(select_current) == 3):
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while (len(self.inputs) > 7):
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self.inputs.remove(self.inputs.values()[-1])
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#X lin limits
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self.add_input('LnxBoolSocket', 'X linear')
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self.add_input('LnxFloatSocket', 'X lin lower')
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self.add_input('LnxFloatSocket', 'X lin upper')
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#Arguements for type Piston
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if (self.get_count_in(select_current) == 4):
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while (len(self.inputs) > 7):
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self.inputs.remove(self.inputs.values()[-1])
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#X lin limits
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self.add_input('LnxBoolSocket', 'X linear')
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self.add_input('LnxFloatSocket', 'X lin lower')
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self.add_input('LnxFloatSocket', 'X lin upper')
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#X ang limits
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self.add_input('LnxBoolSocket', 'X angle')
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self.add_input('LnxFloatSocket', 'X ang lower', -45.0)
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self.add_input('LnxFloatSocket', 'X ang upper', 45.0)
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#Arguements for type GenericSpring
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if (self.get_count_in(select_current) == 5):
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while (len(self.inputs) > 7):
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self.inputs.remove(self.inputs.values()[-1])
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self['property0'] = value
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property0: HaxeEnumProperty(
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'property0',
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items = [('Fixed', 'Fixed', 'Fixed'),
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('Point', 'Point', 'Point'),
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('Hinge', 'Hinge', 'Hinge'),
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('Slider', 'Slider', 'Slider'),
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('Piston', 'Piston', 'Piston'),
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('Generic Spring', 'Generic Spring', 'Generic Spring')],
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name='Type', default='Fixed', set=set_enum, get=get_enum)
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def __init__(self):
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array_nodes[str(id(self))] = self
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def lnx_init(self, context):
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self.add_input('LnxNodeSocketAction', 'In')
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self.add_input('LnxNodeSocketObject', 'Pivot Object')
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self.add_input('LnxNodeSocketObject', 'RB 1')
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self.add_input('LnxNodeSocketObject', 'RB 2')
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self.add_input('LnxBoolSocket', 'Disable Collissions')
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self.add_input('LnxBoolSocket', 'Breakable')
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self.add_input('LnxFloatSocket', 'Breaking Threshold')
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self.add_output('LnxNodeSocketAction', 'Out')
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def draw_buttons(self, context, layout):
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layout.prop(self, 'property0')
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#GenericSpring:
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if (self.get_count_in(self.property0) == 5):
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grid0 = layout.grid_flow(row_major=True, columns=1, align=True)
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grid0.label(text="Possible Constraints:")
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grid0.label(text="Linear [X, Y, Z]")
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grid0.label(text="Angular [X, Y, Z]")
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grid0.label(text="Spring Linear [X, Y, Z]")
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grid0.label(text="Spring Angular [X, Y, Z]")
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row = layout.row(align=True)
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column = row.column(align=True)
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op = column.operator('lnx.node_add_input', text='Add Constraint', icon='PLUS', emboss=True)
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op.node_index = str(id(self))
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op.socket_type = 'LnxDynamicSocket'
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op.name_format = 'Constraint {0}'.format(len(self.inputs) - 6)
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column1 = row.column(align=True)
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op = column1.operator('lnx.node_remove_input', text='', icon='X', emboss=True)
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op.node_index = str(id(self))
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#Static inputs
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if len(self.inputs) < 8:
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column1.enabled = False
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#Max Possible inputs
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if len(self.inputs) > 18:
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column.enabled = False
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