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277 lines
10 KiB
277 lines
10 KiB
#!/usr/bin/env python
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"""
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collisionbox Lua generator
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1. Select a mob mesh or an Empty
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2. Press the "Run Script" button below
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- The script copies the collisionbox the the clipboard.
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- An 'Empty' with the object's name will appear,
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which visually represents the collisionbox
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(which MUST be symmetrical on horizontal axes and
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centered at 0,0,0 for Minetest, since
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collision boxes to not turn).
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3. To adjust, scale the Empty.collisionbox.* object
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in Blender then repeat steps 1-2. To keep the Empty
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symmetrical for Minetest, scale ONLY with one
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of the following hotkey sequences (with
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the mouse pointer in the 3D View):
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- 's'
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- 's', 'z'
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- 's', "shift z"
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How to use: Paste this script into a Blender"
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Text Editor panel, select an object,"
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press the 'Run Script' button")
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"""
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print("""
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STARTING generate_lua_collisionbox...
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""")
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y_up = True
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enable_minetest = True
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enable_lowest_h = False
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enable_center_h = False
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if enable_minetest:
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enable_lowest_h = True
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enable_center_h = True
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hs = (0, 1) # horizontal axis indices
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v = 2 # vertical axis index
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# Do NOT swap until end.
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#if y_up:
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# hs = (0, 2)
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# v = 1
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try:
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import bpy
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except ImportError:
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print(__doc__)
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exit(1)
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# from mathutils import Matrix
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from mathutils import Vector
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# from mathutils import Euler
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def calculate_one():
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ob1 = None
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ob1 = bpy.context.active_object # works with 2.7 or 2.8
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calculate_collisionbox(ob1)
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class MessageBox(bpy.types.Operator):
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bl_idname = "message.messagebox"
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bl_label = ""
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message = bpy.props.StringProperty(
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name = "message",
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description = "message",
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default = ''
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)
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def execute(self, context):
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self.report({'INFO'}, self.message)
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# print(self.message)
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return {'FINISHED'}
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def invoke(self, context, event):
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return context.window_manager.invoke_props_dialog(self,
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width=400)
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def draw(self, context):
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self.layout.label(text=self.message)
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self.layout.label(text="")
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# col = self.layout.column(align = True)
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# col.prop(context.scene, "my_string_prop")
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bpy.utils.register_class(MessageBox)
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msgSuffix = ""
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def calculate_collisionbox(ob1):
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global msgSuffix
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mesh = None
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if ob1 is None:
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if len(bpy.context.selected_objects) > 0:
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ob1 = bpy.context.selected_objects[0]
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if ob1 is not None:
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mesh = ob1.data
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if ob1 is None:
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msg = "Nothing is selected."
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bpy.ops.message.messagebox('INVOKE_DEFAULT', message = msg)
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elif (mesh is not None) and (not hasattr(mesh, 'vertices')):
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msg = ("A collision box cannot be calculated for a non-mesh"
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" object.")
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bpy.ops.message.messagebox('INVOKE_DEFAULT', message = msg)
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else:
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# extents1 = ob1.dimensions.copy()
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obj1Loc = ob1.location
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# See https://blender.stackexchange.com/questions/8459/get-blender-x-y-z-and-bounding-box-with-script
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# bbox_corners = [ob1.matrix_world * Vector(corner) for corner in ob1.bound_box]
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# See https://blender.stackexchange.com/questions/6139/how-to-iterate-through-all-vertices-of-an-object-that-contains-multiple-meshes
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# print("mesh:" + str(mesh))
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# print("hasattr(mesh, 'vertices'):"
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# + str(hasattr(mesh, 'vertices')))]
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mins = [None, None, None] # minimums; in outer scope for checks.
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maxes = [None, None, None] # minimums; in outer scope for checks.
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if mesh is not None:
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wm = ob1.matrix_world
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for vert in mesh.vertices:
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# This matrix multiplication is NOT transitive.
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try:
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loc = wm @ vert.co
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except TypeError:
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loc = wm * vert.co # Blender <2.8
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# NOTE: swap y and z for Minetest (y-up) LATER
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coords = (loc.x, loc.y, loc.z)
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for i in range(3):
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if (mins[i] is None) or (coords[i] < mins[i]):
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mins[i] = coords[i]
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if (maxes[i] is None) or (coords[i] > maxes[i]):
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maxes[i] = coords[i]
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# print(str(extents1))
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# print("--by vertices (raw):")
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# print(" collisionbox = {{{:.2f}, {:.2f}, {:.2f}, {:.2f},"
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# " {:.2f}, {:.2f}}}".format(mins[0], mins[2], mins[1],
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# maxes[0], maxes[2], maxes[1]))
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# Use ob1.matrix_world (above) instead of incrementing
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# ob1.location.x, y, and z
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# newNamePrefix = "Empty.EDGE." + ob1.name
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# i = 0
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# wm = ob1.matrix_world
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# for vert in mesh.vertices:
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# newName = newNamePrefix + "." + str(i)
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# # This matrix multiplication is NOT transitive.
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# try:
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# loc = wm @ vert.co
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# except TypeError:
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# loc = wm * vert.co # Blender <2.8
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# isFar = False
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# if loc.x == maxes[0] or loc.y == maxes[1] or loc.z == maxes[2]:
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# isFar = True
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# elif loc.x == mins[0] or loc.y == mins[1] or loc.z == mins[2]:
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# isFar = True
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# if isFar:
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# pass
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# # result = bpy.ops.object.add(type='EMPTY', radius=.25,
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# # location=loc)
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# # NOTE: result is merely {'FINISHED'}
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# # print("{:.2f}, {:.2f}, {:.2f}".format(loc.x, loc.y,
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# # loc.z))
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# bpy.ops.object.add_named(name=newName, type='EMPTY',
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# radius=.25, location=loc)
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# i += 1
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else:
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extents1 = ob1.scale.copy()
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print(dir(ob1))
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# Object is an empty, so scale up for Minetest
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try:
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extents1.x = extents1.x * (ob1.empty_display_size * 2.0)
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extents1.y = extents1.y * (ob1.empty_display_size * 2.0)
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extents1.z = extents1.z * (ob1.empty_display_size * 2.0)
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except AttributeError:
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# Blender 2.7
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extents1.x = extents1.x * (ob1.empty_draw_size * 2.0)
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extents1.y = extents1.y * (ob1.empty_draw_size * 2.0)
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extents1.z = extents1.z * (ob1.empty_draw_size * 2.0)
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mins[0] = obj1Loc.x - extents1.x / 2.0
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maxes[0] = obj1Loc.x + extents1.x / 2.0
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mins[1] = obj1Loc.y - extents1.y / 2.0
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maxes[1] = obj1Loc.y + extents1.y / 2.0
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mins[2] = obj1Loc.z - extents1.z / 2.0
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maxes[2] = obj1Loc.z + extents1.z / 2.0
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msgSuffix = " (using Empty object's scale)"
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# print("--using empty object:")
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# use ground as bottom (don't do this--it is not the Minetest way)
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# if mins[2] < 0.0:
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# maxes[1] -= mins[1]
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# mins[1] = 0.0
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# print(" collisionbox = {{{:.2f}, {:.2f}, {:.2f}, {:.2f}, {:.2f},"
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# " {:.2f}}}".format(mins[0], mins[1], mins[2], maxes[0], maxes[1], maxes[2]))
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sizes = [None, None, None]
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centers = [None, None, None]
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for i in range(3):
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sizes[i] = maxes[i] - mins[i]
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centers[i] = mins[i] + sizes[i] / 2.0
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if enable_lowest_h:
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# OK to use z as up, since will y&z will be swapped if y_up
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hSize = None
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for i in range(len(hs)):
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axis_i = hs[i]
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if (hSize is None) or (sizes[axis_i] < hSize):
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hSize = sizes[axis_i]
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for i in range(len(hs)):
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axis_i = hs[i]
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sizes[axis_i] = hSize
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mins[axis_i] = centers[axis_i] - hSize / 2
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maxes[axis_i] = mins[axis_i] + hSize
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if enable_center_h:
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for i in range(len(hs)):
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axis_i = hs[i]
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centers[i] = 0
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mins[axis_i] = centers[axis_i] - sizes[axis_i] / 2
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maxes[axis_i] = mins[axis_i] + sizes[axis_i]
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loc = (centers[0], centers[1], centers[2])
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bpy.ops.object.add(type='EMPTY', radius=.5, location=loc)
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collisionboxName = "Empty.collisionbox." + ob1.name
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newEmpty = bpy.context.object # works with 2.7 or 2.8
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# newEmpty = bpy.context.selected_objects[0]
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try:
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pass
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# bpy.context.scene.collection.objects.link(newEmpty)
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except AttributeError:
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# Blender 2.7
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pass
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newEmpty.name = collisionboxName
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newEmpty.location = (centers[0], centers[1], centers[2])
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try:
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newEmpty.empty_display_type = 'CUBE'
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# newEmpty.empty_display_size = (sizes[0], sizes[1], sizes[2])
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except AttributeError:
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# Blender 2.7:
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newEmpty.empty_draw_type = 'CUBE'
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# newEmpty.empty_draw_size = (sizes[0], sizes[1], sizes[2])
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# newEmpty.dimensions = (sizes[0], sizes[1], sizes[2])
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# newEmpty.scale = (sizes[0]/2.0, sizes[1]/2.0, sizes[2]/2.0)
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newEmpty.scale = (sizes[0], sizes[1], sizes[2])
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if enable_minetest:
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for i in range(3):
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mins[i] /= 10.0
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maxes[i] /= 10.0
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msg = ('Size is not available. Make sure you have a mesh object'
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' selected.')
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if mins[0] is not None:
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# swap y and z for Minetest (y-up):
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if y_up:
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tmp = mins[1]
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mins[1] = mins[2]
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mins[2] = tmp
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tmp = maxes[1]
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maxes[1] = maxes[2]
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maxes[2] = tmp
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msg = (" collisionbox = {{{:.2f}, {:.2f}, {:.2f}, {:.2f},"
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" {:.2f}, {:.2f}}}".format(mins[0], mins[1], mins[2],
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maxes[0], maxes[1], maxes[2]))
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if len(msgSuffix) > 0:
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msgSuffix = " -- " + msgSuffix
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bpy.context.window_manager.clipboard = msg + msgSuffix
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msg += " --copied to clipboard"
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# if enable_minetest:
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# msg += " -- *10"
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print(msg)
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bpy.ops.message.messagebox('INVOKE_DEFAULT', message=msg)
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# Unregistering before user clicks the MessageBox will crash Blender!
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# bpy.utils.unregister_class(MessageBox)
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calculate_one()
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