Revision: 36761 http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=36761 Author: campbellbarton Date: 2011-05-19 04:28:09 +0000 (Thu, 19 May 2011) Log Message: ----------- add python access to mathutils.intersect_line_plane, update view3d_utils module to use it.
Modified Paths: -------------- trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py trunk/blender/source/blender/python/generic/mathutils_geometry.c Modified: trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py =================================================================== --- trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py 2011-05-19 03:59:52 UTC (rev 36760) +++ trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py 2011-05-19 04:28:09 UTC (rev 36761) @@ -19,17 +19,6 @@ # <pep8 compliant> -def _is_persp_matrix(persmat, eps=0.00001): - """ - crummy way to check if its a perspective matrix - """ - return not ( - abs(persmat[0][3]) < eps and \ - abs(persmat[1][3]) < eps and \ - abs(persmat[2][3]) < eps and \ - abs(persmat[3][3] - 1.0) < eps) - - def region_2d_to_vector_3d(region, rv3d, coord): """ Return a direction vector from the viewport at the spesific 2d region @@ -47,13 +36,13 @@ """ from mathutils import Vector - persmat = rv3d.perspective_matrix.copy() viewvec = rv3d.view_matrix.inverted()[2].xyz.normalized() - if _is_persp_matrix(persmat): + if rv3d.is_perspective: dx = (2.0 * coord[0] / region.width) - 1.0 dy = (2.0 * coord[1] / region.height) - 1.0 - + + persmat = rv3d.perspective_matrix.copy() perspinv_x, perspinv_y = persmat.inverted().to_3x3()[0:2] return ((perspinv_x * dx + perspinv_y * dy) - viewvec).normalized() else: @@ -78,24 +67,30 @@ :return: normalized 3d vector. :rtype: :class:`Vector` """ + from mathutils import Vector from mathutils.geometry import intersect_point_line persmat = rv3d.perspective_matrix.copy() + coord_vec = region_2d_to_vector_3d(region, rv3d, coord) + depth_location = Vector(depth_location) - if _is_persp_matrix(persmat): + if rv3d.is_perspective: + from mathutils.geometry import intersect_line_plane + origin_start = rv3d.view_matrix.inverted()[3].to_3d() + origin_end = origin_start + coord_vec + view_vec = rv3d.view_matrix.inverted()[2] + return intersect_line_plane(origin_start, origin_end, depth_location, view_vec, 1) else: dx = (2.0 * coord[0] / region.width) - 1.0 dy = (2.0 * coord[1] / region.height) - 1.0 persinv = persmat.inverted() viewinv = rv3d.view_matrix.inverted() origin_start = (persinv[0].xyz * dx) + (persinv[1].xyz * dy) + viewinv[3].xyz + origin_end = origin_start + coord_vec + return intersect_point_line(depth_location, origin_start, origin_end)[0] - origin_end = origin_start + region_2d_to_vector_3d(region, rv3d, coord) - - return intersect_point_line(depth_location, origin_start, origin_end)[0] - def location_3d_to_region_2d(region, rv3d, coord): """ Return the *region* relative 2d location of a 3d position. Modified: trunk/blender/source/blender/python/generic/mathutils_geometry.c =================================================================== --- trunk/blender/source/blender/python/generic/mathutils_geometry.c 2011-05-19 03:59:52 UTC (rev 36760) +++ trunk/blender/source/blender/python/generic/mathutils_geometry.c 2011-05-19 04:28:09 UTC (rev 36761) @@ -497,6 +497,60 @@ } +static char M_Geometry_intersect_line_plane_doc[] = +".. function:: intersect_line_plane(line_a, line_b, plane_co, plane_no, no_flip=False)\n" +"\n" +" Takes 2 lines (as 4 vectors) and returns a vector for their point of intersection or None.\n" +"\n" +" :arg line_a: First point of the first line\n" +" :type line_a: :class:`mathutils.Vector`\n" +" :arg line_b: Second point of the first line\n" +" :type line_b: :class:`mathutils.Vector`\n" +" :arg plane_co: A point on the plane\n" +" :type plane_co: :class:`mathutils.Vector`\n" +" :arg plane_no: The direction the plane is facing\n" +" :type plane_no: :class:`mathutils.Vector`\n" +" :arg no_flip: Always return an intersection on the directon defined bt line_a -> line_b\n" +" :type no_flip: :boolean\n" +" :return: The point of intersection or None when not found\n" +" :rtype: :class:`mathutils.Vector` or None\n" +; +static PyObject *M_Geometry_intersect_line_plane(PyObject *UNUSED(self), PyObject* args) +{ + VectorObject *line_a, *line_b, *plane_co, *plane_no; + int no_flip= 0; + float isect[3]; + if(!PyArg_ParseTuple(args, "O!O!O!O!|i:intersect_line_line_2d", + &vector_Type, &line_a, + &vector_Type, &line_b, + &vector_Type, &plane_co, + &vector_Type, &plane_no, + &no_flip) + ) { + return NULL; + } + + if( BaseMath_ReadCallback(line_a) == -1 || + BaseMath_ReadCallback(line_b) == -1 || + BaseMath_ReadCallback(plane_co) == -1 || + BaseMath_ReadCallback(plane_no) == -1 + ) { + return NULL; + } + + if(ELEM4(2, line_a->size, line_b->size, plane_co->size, plane_no->size)) { + PyErr_SetString(PyExc_RuntimeError, "geometry.intersect_line_plane(...) can't use 2D Vectors"); + return NULL; + } + + if(isect_line_plane_v3(isect, line_a->vec, line_b->vec, plane_co->vec, plane_no->vec, no_flip) == 1) { + return newVectorObject(isect, 3, Py_NEW, NULL); + } + else { + Py_RETURN_NONE; + } +} + static char M_Geometry_intersect_point_line_doc[] = ".. function:: intersect_point_line(pt, line_p1, line_p2)\n" "\n" @@ -860,6 +914,7 @@ {"intersect_point_quad_2d", (PyCFunction) M_Geometry_intersect_point_quad_2d, METH_VARARGS, M_Geometry_intersect_point_quad_2d_doc}, {"intersect_line_line", (PyCFunction) M_Geometry_intersect_line_line, METH_VARARGS, M_Geometry_intersect_line_line_doc}, {"intersect_line_line_2d", (PyCFunction) M_Geometry_intersect_line_line_2d, METH_VARARGS, M_Geometry_intersect_line_line_2d_doc}, + {"intersect_line_plane", (PyCFunction) M_Geometry_intersect_line_plane, METH_VARARGS, M_Geometry_intersect_line_plane_doc}, {"interpolate_bezier", (PyCFunction) M_Geometry_interpolate_bezier, METH_VARARGS, M_Geometry_interpolate_bezier_doc}, {"area_tri", (PyCFunction) M_Geometry_area_tri, METH_VARARGS, M_Geometry_area_tri_doc}, {"normal", (PyCFunction) M_Geometry_normal, METH_VARARGS, M_Geometry_normal_doc}, _______________________________________________ Bf-blender-cvs mailing list Bf-blender-cvs@blender.org http://lists.blender.org/mailman/listinfo/bf-blender-cvs