typedef int PK_blend_walls_t; It has the values: PK_blend_walls_trim_no_c Do not trim walls. The walls will not be trimmed. The blend will not be attached to the walls but will be created as a separate sheet body. PK_blend_walls_trim_both_c Trim both walls. The walls will be trimmed by the blend boundaries. The blend will not be attached to the walls but will be created as a separate sheet body. This token is only valid if the blend is being formed between two sheet bodies. PK_blend_walls_attach_c Trim walls and attach blend. The walls will be trimmed by the blend boundaries. The blend will be attached to the walls. If the walls lie in different bodies the bodies will be combined, with the body containing the left wall being considered as the target body. If left_sense and right_sense are not the same, the body containing the right wall will be negated in order to produce a consistent result. (default) PK_blend_walls_solid_c Trim walls, attach blend and make solid. As for PK_blend_walls_attach_c, with the addition that if the result of the blending operation encloses a volume then a solid body will be created. Otherwise a sheet body will be returned.