mesh_easylattice.py

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#
#  This program 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 2
#  of the License, or (at your option) any later version.
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#  GNU General Public License for more details.
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#  along with this program; if not, write to the Free Software Foundation,
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# ##### END GPL LICENSE BLOCK #####

# TODO: find a better solution for allowing more than one lattice per scene

bl_info = {
    "name": "Easy Lattice Object",
    "author": "Kursad Karatas",
    "version": (0, 5, 1),
    "blender": (2, 66, 0),
    "location": "View3D > Easy Lattice",
    "description": "Create a lattice for shape editing",
    "warning": "",
    "wiki_url": "https://wiki.blender.org/index.php/Easy_Lattice_Editing_Addon",
    "tracker_url": "https://bitbucket.org/kursad/blender_addons_easylattice/src",
    "category": "Mesh"}


import bpy
from mathutils import (
        Matrix,
        Vector,
        )
from bpy.types import Operator
from bpy.props import (
        EnumProperty,
        IntProperty,
        StringProperty,
        )


# Cleanup
def modifiersDelete(obj):
    for mod in obj.modifiers:
        if mod.name == "latticeeasytemp":
            try:
                if mod.object == bpy.data.objects['LatticeEasytTemp']:
                    bpy.ops.object.modifier_apply(apply_as='DATA', modifier=mod.name)
            except:
                bpy.ops.object.modifier_remove(modifier=mod.name)


def modifiersApplyRemove(obj):
    bpy.ops.object.select_all(action='DESELECT')
    bpy.ops.object.select_pattern(pattern=obj.name, extend=False)
    bpy.context.scene.objects.active = obj

    for mod in obj.modifiers:
        if mod.name == "latticeeasytemp":
            if mod.object == bpy.data.objects['LatticeEasytTemp']:
                bpy.ops.object.modifier_apply(apply_as='DATA', modifier=mod.name)


def latticeDelete(obj):
    bpy.ops.object.select_all(action='DESELECT')
    for ob in bpy.context.scene.objects:
        if "LatticeEasytTemp" in ob.name:
            ob.select = True
    bpy.ops.object.delete(use_global=False)

    obj.select = True


def createLattice(obj, size, pos, props):
    # Create lattice and object
    lat = bpy.data.lattices.new('LatticeEasytTemp')
    ob = bpy.data.objects.new('LatticeEasytTemp', lat)

    loc, rot, scl = getTransformations(obj)

    # the position comes from the bbox
    ob.location = pos

    # the size  from bbox
    ob.scale = size

    # the rotation comes from the combined obj world
    # matrix which was converted to euler pairs
    ob.rotation_euler = buildRot_World(obj)

    ob.show_x_ray = True
    # Link object to scene
    scn = bpy.context.scene
    scn.objects.link(ob)
    scn.objects.active = ob
    scn.update()

    # Set lattice attributes
    lat.interpolation_type_u = props[3]
    lat.interpolation_type_v = props[3]
    lat.interpolation_type_w = props[3]

    lat.use_outside = False

    lat.points_u = props[0]
    lat.points_v = props[1]
    lat.points_w = props[2]

    return ob


def selectedVerts_Grp(obj):
    vertices = obj.data.vertices
    selverts = []

    if obj.mode == "EDIT":
        bpy.ops.object.editmode_toggle()

    for grp in obj.vertex_groups:
        if "templatticegrp" in grp.name:
            bpy.ops.object.vertex_group_set_active(group=grp.name)
            bpy.ops.object.vertex_group_remove()

    tempgroup = obj.vertex_groups.new("templatticegrp")

    for vert in vertices:
        if vert.select is True:
            selverts.append(vert)
            tempgroup.add([vert.index], 1.0, "REPLACE")

    return selverts


def getTransformations(obj):
    rot = obj.rotation_euler
    loc = obj.location
    size = obj.scale

    return [loc, rot, size]


def findBBox(obj, selvertsarray):

    mat = buildTrnScl_WorldMat(obj)
    mat_world = obj.matrix_world

    minx, miny, minz = selvertsarray[0].co
    maxx, maxy, maxz = selvertsarray[0].co

    c = 1

    for c in range(len(selvertsarray)):
        co = selvertsarray[c].co

        if co.x < minx:
            minx = co.x
        if co.y < miny:
            miny = co.y
        if co.z < minz:
            minz = co.z

        if co.x > maxx:
            maxx = co.x
        if co.y > maxy:
            maxy = co.y
        if co.z > maxz:
            maxz = co.z
        c += 1

    minpoint = Vector((minx, miny, minz))
    maxpoint = Vector((maxx, maxy, maxz))

    # middle point has to be calculated based on the real world matrix
    middle = ((minpoint + maxpoint) / 2)

    minpoint = mat * minpoint    # Calculate only based on loc/scale
    maxpoint = mat * maxpoint    # Calculate only based on loc/scale
    middle = mat_world * middle  # the middle has to be calculated based on the real world matrix

    size = maxpoint - minpoint
    size = Vector((abs(size.x), abs(size.y), abs(size.z)))

    return [minpoint, maxpoint, size, middle]


def buildTrnSclMat(obj):
    # This function builds a local matrix that encodes translation
    # and scale and it leaves out the rotation matrix
    # The rotation is applied at obejct level if there is any
    mat_trans = Matrix.Translation(obj.location)
    mat_scale = Matrix.Scale(obj.scale[0], 4, (1, 0, 0))
    mat_scale *= Matrix.Scale(obj.scale[1], 4, (0, 1, 0))
    mat_scale *= Matrix.Scale(obj.scale[2], 4, (0, 0, 1))

    mat_final = mat_trans * mat_scale

    return mat_final


def buildTrnScl_WorldMat(obj):
    # This function builds a real world matrix that encodes translation
    # and scale and it leaves out the rotation matrix
    # The rotation is applied at obejct level if there is any
    loc, rot, scl = obj.matrix_world.decompose()
    mat_trans = Matrix.Translation(loc)

    mat_scale = Matrix.Scale(scl[0], 4, (1, 0, 0))
    mat_scale *= Matrix.Scale(scl[1], 4, (0, 1, 0))
    mat_scale *= Matrix.Scale(scl[2], 4, (0, 0, 1))

    mat_final = mat_trans * mat_scale

    return mat_final


# Feature use
def buildRot_WorldMat(obj):
    # This function builds a real world matrix that encodes rotation
    # and it leaves out translation and scale matrices
    loc, rot, scl = obj.matrix_world.decompose()
    rot = rot.to_euler()

    mat_rot = Matrix.Rotation(rot[0], 4, 'X')
    mat_rot *= Matrix.Rotation(rot[1], 4, 'Z')
    mat_rot *= Matrix.Rotation(rot[2], 4, 'Y')
    return mat_rot


def buildTrn_WorldMat(obj):
    # This function builds a real world matrix that encodes translation
    # and scale and it leaves out the rotation matrix
    # The rotation is applied at obejct level if there is any
    loc, rot, scl = obj.matrix_world.decompose()
    mat_trans = Matrix.Translation(loc)

    return mat_trans


def buildScl_WorldMat(obj):
    # This function builds a real world matrix that encodes translation
    # and scale and it leaves out the rotation matrix
    # The rotation is applied at obejct level if there is any
    loc, rot, scl = obj.matrix_world.decompose()

    mat_scale = Matrix.Scale(scl[0], 4, (1, 0, 0))
    mat_scale *= Matrix.Scale(scl[1], 4, (0, 1, 0))
    mat_scale *= Matrix.Scale(scl[2], 4, (0, 0, 1))

    return mat_scale


def buildRot_World(obj):
    # This function builds a real world rotation values
    loc, rot, scl = obj.matrix_world.decompose()
    rot = rot.to_euler()

    return rot


def run(lat_props):
    obj = bpy.context.object

    if obj.type == "MESH":
        # set global property for the currently active latticed object
        # removed in __init__ on unregister if created
        bpy.types.Scene.activelatticeobject = StringProperty(
                name="currentlatticeobject",
                default=""
                )
        bpy.types.Scene.activelatticeobject = obj.name

        modifiersDelete(obj)
        selvertsarray = selectedVerts_Grp(obj)
        bbox = findBBox(obj, selvertsarray)

        size = bbox[2]
        pos = bbox[3]

        latticeDelete(obj)
        lat = createLattice(obj, size, pos, lat_props)

        modif = obj.modifiers.new("latticeeasytemp", "LATTICE")
        modif.object = lat
        modif.vertex_group = "templatticegrp"

        bpy.ops.object.select_all(action='DESELECT')
        bpy.ops.object.select_pattern(pattern=lat.name, extend=False)
        bpy.context.scene.objects.active = lat

        bpy.context.scene.update()
        bpy.ops.object.mode_set(mode='EDIT')

    if obj.type == "LATTICE":
        if bpy.types.Scene.activelatticeobject:
            name = bpy.types.Scene.activelatticeobject

            # Are we in edit lattice mode? If so move on to object mode
            if obj.mode == "EDIT":
                bpy.ops.object.editmode_toggle()

            for ob in bpy.context.scene.objects:
                if ob.name == name:  # found the object with the lattice mod
                    object = ob
                    modifiersApplyRemove(object)
                    latticeDelete(obj)

    return


def main(context, latticeprops):
    run(latticeprops)


class EasyLattice(Operator):
    bl_idname = "object.easy_lattice"
    bl_label = "Easy Lattice Creator"
    bl_description = ("Create a Lattice modifier ready to edit\n"
                      "Needs an existing Active Mesh Object\n"
                      "Note: Works only with one lattice per scene")

    lat_u = IntProperty(
            name="Lattice u",
            description="Points in u direction",
            default=3
            )
    lat_w = IntProperty(
            name="Lattice w",
            description="Points in w direction",
            default=3
            )
    lat_m = IntProperty(
            name="Lattice m",
            description="Points in m direction",
            default=3
            )
    lat_types = (('KEY_LINEAR', "Linear", "Linear Interpolation type"),
                 ('KEY_CARDINAL', "Cardinal", "Cardinal Interpolation type"),
                 ('KEY_BSPLINE', "BSpline", "Key BSpline Interpolation Type")
                )
    lat_type = EnumProperty(
            name="Lattice Type",
            description="Choose Lattice Type",
            items=lat_types,
            default='KEY_LINEAR'
            )

    @classmethod
    def poll(cls, context):
        obj = context.active_object
        return obj is not None and obj.type == "MESH"

    def draw(self, context):
        layout = self.layout

        col = layout.column(align=True)
        col.prop(self, "lat_u")
        col.prop(self, "lat_w")
        col.prop(self, "lat_m")

        layout.prop(self, "lat_type")

    def execute(self, context):
        lat_u = self.lat_u
        lat_w = self.lat_w
        lat_m = self.lat_m

        # enum property no need to complicate things
        lat_type = self.lat_type
        lat_props = [lat_u, lat_w, lat_m, lat_type]
        try:
            main(context, lat_props)

        except Exception as e:
            print("\n[Add Advanced Objects]\nOperator:object.easy_lattice\n{}\n".format(e))
            self.report({'WARNING'},
                         "Easy Lattice Creator could not be completed (See Console for more info)")

            return {"CANCELLED"}

        return {"FINISHED"}

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


def register():
    bpy.utils.register_class(EasyLattice)


def unregister():
    bpy.utils.unregister_class(EasyLattice)


if __name__ == "__main__":
    register()