【转帖】meaning of normal member
 

meaning of normal member
meaning of normal member
many oddbentity classes have a member representing a normal vector. does this vector produce some transformation to the entity if different from the z axis?

yes. the transformation is described in autocad's dxf reference (appendix b - advanced dxf issues/arbitrary axis algorithm)
you can use odgematrix3d methods to get transformation matrices:
worldtoplane(normal), planetoworld(normal)
settoworldtoplane(normal), settoplanetoworld(normal)
note that most accessors return points in world coordinate system (wcs) - already transformed.
oddb2dpolylinevertices are stored in object coordinate system (ocs) - xy plane. to get their world position you have to apply transformation or to use oddb2dpolyline::getvertexposition() method.
it also specifies extrusion direction for 2d entity if thickness is non-zero.
[ march 07, 2003: message edited by: sergey slezkin ]</p>
sergey slezkin

dear sergey
i cannot find any getvertexposition member function in the documentation or headers files

sorry, the function is:
odgepoint3d oddb2dpolyline::vertexposition(const oddb2dvertex&) const;
sergey slezkin