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gimbaljlib.py
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# --------------------------------------------------------------------------
# Blendyn -- file gimbaljlib.py
# Copyright (C) 2015 -- 2021 Andrea Zanoni -- [email protected]
# --------------------------------------------------------------------------
# ***** BEGIN GPL LICENSE BLOCK *****
#
# This file is part of Blendyn, add-on script for Blender.
#
# Blendyn is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Blendyn is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Blendyn. If not, see <http://www.gnu.org/licenses/>.
#
# ***** END GPL LICENCE BLOCK *****
# --------------------------------------------------------------------------
import bpy
import os
from mathutils import *
from math import *
from .utilslib import *
# helper function to parse gimbal joints
def parse_gimbal(rw, ed):
ret_val = True
try:
el = ed['gimbal_' + str(rw[1])]
eldbmsg({'PARSE_ELEM'}, "BLENDYN::parse_gimbal():", el)
eldbmsg({'FOUND_DICT'}, "BLENDYN::parse_gimbal():", el)
el.nodes[0].int_label = int(rw[2])
el.nodes[1].int_label = int(rw[15])
el.offsets[0].value = Vector(( float(rw[3]), float(rw[4]), float(rw[5]) ))
R1 = Matrix().to_3x3()
parse_rotmat(rw, 6, R1)
el.rotoffsets[0].value = R1.to_quaternion();
el.offsets[1].value = Vector(( float(rw[16]), float(rw[17]), float(rw[18]) ))
R2 = Matrix().to_3x3()
parse_rotmat(rw, 19, R2)
el.rotoffsets[1].value = R2.to_quaternion();
# FIXME: this is here to enhance backwards compatibility.
# Should disappear in future versions
el.mbclass = 'elem.joint'
if el.name in bpy.data.objects.keys():
el.blender_object = el.name
el.is_imported = True
pass
except KeyError:
el = ed.add()
el.mbclass = 'elem.joint'
el.type = 'gimbal'
el.int_label = int(rw[1])
eldbmsg({'PARSE_ELEM'}, "BLENDYN::parse_gimbal():", el)
eldbmsg({'NOTFOUND_DICT'}, "BLENDYN::parse_gimbal():", el)
el.nodes.add()
el.nodes[0].int_label = int(rw[2])
el.nodes.add()
el.nodes[1].int_label = int(rw[15])
el.offsets.add()
el.offsets[0].value = Vector(( float(rw[3]), float(rw[4]), float(rw[5]) ))
el.rotoffsets.add()
R1 = Matrix().to_3x3()
parse_rotmat(rw, 6, R1)
el.rotoffsets[0].value = R1.to_quaternion();
el.offsets.add()
el.offsets[1].value = Vector(( float(rw[16]), float(rw[17]), float(rw[18]) ))
el.rotoffsets.add()
R2 = Matrix().to_3x3()
parse_rotmat(rw, 19, R2)
el.rotoffsets[1].value = R2.to_quaternion();
el.import_function = "blendyn.import_gimbal"
el.info_draw = "gimbal_info_draw"
el.name = el.type + "_" + str(el.int_label)
el.is_imported = True
ret_val = False
pass
return ret_val
# --------------------------------------------------------------------------
# end of parse_gimbal(rw, ed) function
# function that displays gimbal info in panel -- [ optional ]
def gimbal_info_draw(elem, layout):
nd = bpy.context.scene.mbdyn.nodes
row = layout.row()
col = layout.column(align=True)
try:
node = nd['node_' + str(elem.nodes[0].int_label)]
# Display node 1 info
col.prop(node, "int_label", text = "Node 1 ID ")
col.prop(node, "string_label", text = "Node 1 label ")
col.prop(node, "blender_object", text = "Node 1 Object: ")
col.enabled = False
# Display offset of node 1 info
row = layout.row()
row.label(text = "offset 1 w.r.t. Node " + node.string_label + " R.F.")
col = layout.column(align = True)
col.prop(elem.offsets[0], "value", text = "", slider = False)
node = nd['node_' + str(elem.nodes[1].int_label)]
# Display node 2 info
col.prop(node, "int_label", text = "Node 2 ID ")
col.prop(node, "string_label", text = "Node 2 label ")
col.prop(node, "blender_object", text = "Node 2 Object: ")
col.enabled = False
# Display offset of node 2 info
row = layout.row()
row.label(text = "offset 2 w.r.t. Node " + node.string_label + " R.F.")
col = layout.column(align = True)
col.prop(elem.offsets[1], "value", text = "", slider = False)
layout.separator()
return {'FINISHED'}
except KeyError:
return {'NODE_NOTFOUND'}
# -----------------------------------------------------------
# end of gimbal_info_draw(elem, layout) function
# Creates the object representing a gimbal joint element
def spawn_gimbal_element(elem, context):
""" Draws a gimbal joint element, loading a wireframe
object from the addon library """
mbs = context.scene.mbdyn
nd = mbs.nodes
if any(obj == elem.blender_object for obj in context.scene.objects.keys()):
return {'OBJECT_EXISTS'}
try:
n1 = nd['node_' + str(elem.nodes[0].int_label)].blender_object
except KeyError:
return {'NODE1_NOTFOUND'}
try:
n2 = nd['node_' + str(elem.nodes[1].int_label)].blender_object
except KeyError:
return {'NODE2_NOTFOUND'}
# nodes' objects
n1OBJ = bpy.data.objects[n1]
n2OBJ = bpy.data.objects[n2]
try:
set_active_collection('joints')
elcol = bpy.data.collections.new(name = elem.name)
bpy.data.collections['joints'].children.link(elcol)
set_active_collection(elcol.name)
# load the wireframe gimbal joint object from the library
bpy.ops.wm.append(directory = os.path.join(mbs.addon_path,\
'library', 'joints.blend', 'Object'), filename = 'gimbal')
# the append operator leaves just the imported object selected
gimbaljOBJ = bpy.context.selected_objects[0]
gimbaljOBJ.name = elem.name
# automatic scaling
s = (.5/sqrt(3.))*(n1OBJ.scale.magnitude + \
n2OBJ.scale.magnitude)
gimbaljOBJ.scale = Vector(( s, s, s ))
# joint offsets with respect to nodes
f1 = Vector(( elem.offsets[0].value[0:] ))
f2 = Vector(( elem.offsets[1].value[0:] ))
q1 = Quaternion(( elem.rotoffsets[0].value[0:] ))
q2 = Quaternion(( elem.rotoffsets[1].value[0:] ))
# project offsets in global frame
R1 = n1OBJ.rotation_quaternion.to_matrix()
R2 = n2OBJ.rotation_quaternion.to_matrix()
p1 = n1OBJ.location + R1@f1
p2 = n1OBJ.location + R2@f2
# place the joint object in the position defined relative to node 2
gimbaljOBJ.location = p1
gimbaljOBJ.rotation_mode = 'QUATERNION'
gimbaljOBJ.rotation_quaternion = [email protected]_quaternion
bpy.ops.wm.append(directory = os.path.join(mbs.addon_path,\
'library', 'joints.blend', 'Object'), filename = 'gimbal_child')
gimbal_childobj = bpy.context.selected_objects[0]
# position it correctly
gimbal_childobj.location = gimbaljOBJ.location
# rotate it according to "position orientation" w.r.t. node 1
gimbal_childobj.rotation_mode = 'QUATERNION'
gimbal_childobj.rotation_quaternion = [email protected]_quaternion
# join objects, with context override
gimbaljOBJs = [gimbaljOBJ, gimbal_childobj]
ctx = bpy.context.copy()
ctx['active_object'] = gimbaljOBJs[0]
ctx['selected_editable_objects'] = gimbaljOBJs
if bpy.app.version < (4, 0, 0):
bpy.ops.object.join(ctx)
else:
with context.temp_override(**ctx):
bpy.ops.object.join()
# set parenting of wireframe obj
parenting(gimbaljOBJ, n1OBJ)
gimbaljOBJ.mbdyn.dkey = elem.name
gimbaljOBJ.mbdyn.type = 'element'
elem.blender_object = gimbaljOBJ.name
# link objects to element collection
elcol.objects.link(n1OBJ)
elcol.objects.link(n2OBJ)
set_active_collection('Master Collection')
return {'FINISHED'}
except FileNotFoundError:
return {'LIBRARY_ERROR'}
except KeyError:
return {'COLLECTION_ERROR'}
# -----------------------------------------------------------
# end of spawn_gimbal_element(elem, context) function
# Imports a gimbal Joint in the scene
class BLENDYN_OT_import_gimbal(bpy.types.Operator):
""" Imports a gimbal joint element into the Blender scene """
bl_idname = "blendyn.import_gimbal"
bl_label = "Imports a gimbal joint element"
int_label: bpy.props.IntProperty()
def draw(self, context):
layout = self.layout
layout.alignment = 'LEFT'
def execute(self, context):
ed = bpy.context.scene.mbdyn.elems
nd = bpy.context.scene.mbdyn.nodes
try:
elem = ed['gimbal_' + str(self.int_label)]
retval = spawn_gimbal_element(elem, context)
if retval == {'OBJECT_EXISTS'}:
eldbmsg(retval, type(self).__name__ + '::execute()', elem)
return {'CANCELLED'}
elif retval == {'NODE1_NOTFOUND'}:
eldbmsg(retval, type(self).__name__ + '::execute()', elem)
return {'CANCELLED'}
elif retval == {'NODE2_NOTFOUND'}:
eldbmsg(retval, type(self).__name__ + '::execute()', elem)
return {'CANCELLED'}
elif retval == {'COLLECTION_ERROR'}:
eldbmsf(retval, type(self).__name__ + '::execute()', elem)
return {'CANCELLED'}
elif retval == {'LIBRARY_ERROR'}:
eldbmsg(retval, type(self).__name__ + '::execute()', elem)
return {'CANCELLED'}
elif retval == {'FINISHED'}:
eldbmsg({'IMPORT_SUCCESS'}, type(self).__name__ + '::execute()', elem)
return retval
else:
# Should not be reached
return retval
except KeyError:
eldbmsg({'DICT_ERROR'}, type(self).__name__ + '::execute()', elem)
return {'CANCELLED'}
# -----------------------------------------------------------
# end of BLENDYN_OT_import_gimbal class.