forked from bartvdbraak/blender
e0db647d35
In some cases when:
* the viewport was in the camera mode
* the camera was ortho
* the view was not fitting (as oppose to use HOME)
region_2d_to_origin_3d would misbehave (and consequently region_2d_to_location_3d).
Sample addon to test it:
```
import bpy
from bpy_extras.view3d_utils import (
region_2d_to_location_3d,
)
from mathutils import (
Vector,
)
class MoveXYOperator(bpy.types.Operator):
"""Translate the view using mouse events"""
bl_idname = "view3d.move_xy"
bl_label = "Move XY"
@classmethod
def poll(cls, context):
return context.object
def modal(self, context, event):
if event.type == 'MOUSEMOVE':
self.move(context, event)
elif event.type in {'LEFTMOUSE', 'RIGHTMOUSE', 'ESC'}:
return {'FINISHED'}
return {'RUNNING_MODAL'}
def invoke(self, context, event):
if context.space_data.type == 'VIEW_3D':
self.ob = context.object
context.window_manager.modal_handler_add(self)
return {'RUNNING_MODAL'}
else:
self.report({'WARNING'}, "Active space must be a View3d")
return {'CANCELLED'}
def move(self, context, event):
xy = region_2d_to_location_3d(
context.region,
context.space_data.region_3d,
(event.mouse_region_x, event.mouse_region_y),
Vector(),
).xy
self.ob.location.xy = xy
def register():
bpy.utils.register_class(MoveXYOperator)
def unregister():
bpy.utils.unregister_class(MoveXYOperator)
if __name__ == "__main__":
register()
```
192 lines
6.9 KiB
Python
192 lines
6.9 KiB
Python
# ##### BEGIN GPL LICENSE BLOCK #####
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# ##### END GPL LICENSE BLOCK #####
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# <pep8-80 compliant>
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__all__ = (
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"region_2d_to_vector_3d",
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"region_2d_to_origin_3d",
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"region_2d_to_location_3d",
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"location_3d_to_region_2d",
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)
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def region_2d_to_vector_3d(region, rv3d, coord):
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"""
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Return a direction vector from the viewport at the specific 2d region
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coordinate.
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:arg region: region of the 3D viewport, typically bpy.context.region.
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:type region: :class:`bpy.types.Region`
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:arg rv3d: 3D region data, typically bpy.context.space_data.region_3d.
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:type rv3d: :class:`bpy.types.RegionView3D`
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:arg coord: 2d coordinates relative to the region:
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(event.mouse_region_x, event.mouse_region_y) for example.
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:type coord: 2d vector
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:return: normalized 3d vector.
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:rtype: :class:`mathutils.Vector`
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"""
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from mathutils import Vector
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viewinv = rv3d.view_matrix.inverted()
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if rv3d.is_perspective:
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persinv = rv3d.perspective_matrix.inverted()
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out = Vector(((2.0 * coord[0] / region.width) - 1.0,
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(2.0 * coord[1] / region.height) - 1.0,
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-0.5
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))
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w = out.dot(persinv[3].xyz) + persinv[3][3]
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view_vector = ((persinv * out) / w) - viewinv.translation
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else:
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view_vector = -viewinv.col[2].xyz
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view_vector.normalize()
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return view_vector
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def region_2d_to_origin_3d(region, rv3d, coord, clamp=None):
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"""
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Return the 3d view origin from the region relative 2d coords.
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.. note::
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Orthographic views have a less obvious origin,
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the far clip is used to define the viewport near/far extents.
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Since far clip can be a very large value,
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the result may give with numeric precision issues.
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To avoid this problem, you can optionally clamp the far clip to a
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smaller value based on the data you're operating on.
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:arg region: region of the 3D viewport, typically bpy.context.region.
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:type region: :class:`bpy.types.Region`
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:arg rv3d: 3D region data, typically bpy.context.space_data.region_3d.
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:type rv3d: :class:`bpy.types.RegionView3D`
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:arg coord: 2d coordinates relative to the region;
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(event.mouse_region_x, event.mouse_region_y) for example.
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:type coord: 2d vector
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:arg clamp: Clamp the maximum far-clip value used.
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(negative value will move the offset away from the view_location)
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:type clamp: float or None
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:return: The origin of the viewpoint in 3d space.
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:rtype: :class:`mathutils.Vector`
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"""
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viewinv = rv3d.view_matrix.inverted()
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if rv3d.is_perspective:
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origin_start = viewinv.translation.copy()
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else:
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persmat = rv3d.perspective_matrix.copy()
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dx = (2.0 * coord[0] / region.width) - 1.0
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dy = (2.0 * coord[1] / region.height) - 1.0
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persinv = persmat.inverted()
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origin_start = ((persinv.col[0].xyz * dx) +
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(persinv.col[1].xyz * dy) +
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persinv.translation)
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if clamp != 0.0:
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if rv3d.view_perspective != 'CAMERA':
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# this value is scaled to the far clip already
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origin_offset = persinv.col[2].xyz
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if clamp is not None:
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if clamp < 0.0:
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origin_offset.negate()
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clamp = -clamp
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if origin_offset.length > clamp:
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origin_offset.length = clamp
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origin_start -= origin_offset
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return origin_start
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def region_2d_to_location_3d(region, rv3d, coord, depth_location):
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"""
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Return a 3d location from the region relative 2d coords, aligned with
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*depth_location*.
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:arg region: region of the 3D viewport, typically bpy.context.region.
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:type region: :class:`bpy.types.Region`
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:arg rv3d: 3D region data, typically bpy.context.space_data.region_3d.
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:type rv3d: :class:`bpy.types.RegionView3D`
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:arg coord: 2d coordinates relative to the region;
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(event.mouse_region_x, event.mouse_region_y) for example.
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:type coord: 2d vector
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:arg depth_location: the returned vectors depth is aligned with this since
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there is no defined depth with a 2d region input.
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:type depth_location: 3d vector
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:return: normalized 3d vector.
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:rtype: :class:`mathutils.Vector`
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"""
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from mathutils import Vector
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coord_vec = region_2d_to_vector_3d(region, rv3d, coord)
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depth_location = Vector(depth_location)
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origin_start = region_2d_to_origin_3d(region, rv3d, coord)
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origin_end = origin_start + coord_vec
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if rv3d.is_perspective:
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from mathutils.geometry import intersect_line_plane
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viewinv = rv3d.view_matrix.inverted()
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view_vec = viewinv.col[2].copy()
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return intersect_line_plane(origin_start,
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origin_end,
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depth_location,
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view_vec, 1,
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)
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else:
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from mathutils.geometry import intersect_point_line
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return intersect_point_line(depth_location,
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origin_start,
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origin_end,
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)[0]
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def location_3d_to_region_2d(region, rv3d, coord, default=None):
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"""
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Return the *region* relative 2d location of a 3d position.
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:arg region: region of the 3D viewport, typically bpy.context.region.
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:type region: :class:`bpy.types.Region`
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:arg rv3d: 3D region data, typically bpy.context.space_data.region_3d.
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:type rv3d: :class:`bpy.types.RegionView3D`
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:arg coord: 3d worldspace location.
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:type coord: 3d vector
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:arg default: Return this value if ``coord``
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is behind the origin of a perspective view.
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:return: 2d location
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:rtype: :class:`mathutils.Vector` or ``default`` argument.
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"""
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from mathutils import Vector
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prj = rv3d.perspective_matrix * Vector((coord[0], coord[1], coord[2], 1.0))
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if prj.w > 0.0:
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width_half = region.width / 2.0
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height_half = region.height / 2.0
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return Vector((width_half + width_half * (prj.x / prj.w),
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height_half + height_half * (prj.y / prj.w),
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))
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else:
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return default
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