Object.raycast() does not detect intersections where it should #53714

New Issue

dima glib · 2018-01-07T22:54:07+01:00

dima glib commented

2018-01-07 22:54:07 +01:00

System Information
Windows 7, GPU: AMD Radeon HD 8670D

Blender Version
Broken: 2.77-2.79 (up to builder.blender.org version)
Worked: 2.75, 2.76

Short description of error
Object.raycast() does not detect intersection where it should.

Exact steps for others to reproduce the error

create the default scene
select the cube,
paste the following snippet, run it, launch the operator in 3D view
The debug information will be printed to console

In Blender 2.75 and 2.76, raycast detects the cube when the mouse is over any part of it.
In Blender 2.77-2.79, raycast detects the cube only when the mouse is noticeably inside of the cube.

import bpy
 
from bpy_extras.view3d_utils import (
    region_2d_to_location_3d,
    )
 
from mathutils import (
    Vector,
    )
 
class MoveXYOperator(bpy.types.Operator):
    """Test raycast"""
    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):
        mxy = (event.mouse_region_x, event.mouse_region_y)
        xy0 = region_2d_to_location_3d(
                context.region, context.space_data.region_3d,
                mxy, Vector((0,0,100)))
        xy1 = region_2d_to_location_3d(
                context.region, context.space_data.region_3d,
                mxy, Vector((0,0,-100)))
        - print(xy0)
        - print(xy1)
 
        obj = self.ob
       
        m = obj.matrix_world.copy()
        try:
            mi = m.inverted()
        except:
            # this is some degenerate object
            print("degenerate matrix")
            return
        la = mi * xy0
        lb = mi * xy1
        - print(la)
        - print(lb)
       
        res = obj.ray_cast(la, lb)
        print(res[-1])
 
def register():
    bpy.utils.register_class(MoveXYOperator)
 
def unregister():
    bpy.utils.unregister_class(MoveXYOperator)
 
if __name__ == "__main__":
    register()

**System Information** Windows 7, GPU: AMD Radeon HD 8670D **Blender Version** Broken: 2.77-2.79 (up to builder.blender.org version) Worked: 2.75, 2.76 **Short description of error** Object.raycast() does not detect intersection where it should. **Exact steps for others to reproduce the error** * create the default scene * select the cube, * paste the following snippet, run it, launch the operator in 3D view The debug information will be printed to console In Blender 2.75 and 2.76, raycast detects the cube when the mouse is over any part of it. In Blender 2.77-2.79, raycast detects the cube only when the mouse is noticeably inside of the cube. ``` import bpy from bpy_extras.view3d_utils import ( region_2d_to_location_3d, ) from mathutils import ( Vector, ) class MoveXYOperator(bpy.types.Operator): """Test raycast""" 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): mxy = (event.mouse_region_x, event.mouse_region_y) xy0 = region_2d_to_location_3d( context.region, context.space_data.region_3d, mxy, Vector((0,0,100))) xy1 = region_2d_to_location_3d( context.region, context.space_data.region_3d, mxy, Vector((0,0,-100))) - print(xy0) - print(xy1) obj = self.ob m = obj.matrix_world.copy() try: mi = m.inverted() except: # this is some degenerate object print("degenerate matrix") return la = mi * xy0 lb = mi * xy1 - print(la) - print(lb) res = obj.ray_cast(la, lb) print(res[-1]) def register(): bpy.utils.register_class(MoveXYOperator) def unregister(): bpy.utils.unregister_class(MoveXYOperator) if __name__ == "__main__": register() ```

dima glib commented

2018-01-07 22:54:07 +01:00

Added subscriber: @dairin0d

Campbell Barton commented

2018-01-08 01:23:26 +01:00

Added subscriber: @ideasman42

Campbell Barton commented

2018-01-08 01:23:26 +01:00

ray_cast now takes an origin-direction.

https://docs.blender.org/api/blender_python_api_2_78c_release/bpy.types.Object.html#bpy.types.Object.ray_cast

See: 08fb55eea2

`ray_cast` now takes an origin-direction. https://docs.blender.org/api/blender_python_api_2_78c_release/bpy.types.Object.html#bpy.types.Object.ray_cast See: 08fb55eea2

Campbell Barton commented

2018-01-08 01:23:42 +01:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2018-01-08 01:23:42 +01:00

Campbell Barton self-assigned this 2018-01-08 01:23:42 +01:00

dima glib commented

2018-01-08 03:57:40 +01:00

Sorry! I'm so stupid :-(
Mysteriously, this change in semantics somehow did not affect my 3D cursor addon in perspective view, and I only learned that there's a problem when a user pointed out that the addon's snapping doesn't work correctly in orthographic view.

Sorry! I'm so stupid :-( Mysteriously, this change in semantics somehow did not affect my 3D cursor addon in perspective view, and I only learned that there's a problem when a user pointed out that the addon's snapping doesn't work correctly in orthographic view.

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Object.raycast() does not detect intersections where it should #53714