To save space in the drawing database and in the DXF file, the points associated with each entity are expressed in terms of the entity's own object coordinate system OCS. With OCS, the only additional information needed to describe the entity's position in 3D space are the 3D vector describing the Z axis of the OCS and the elevation value. To save space in the drawing database and in the DXF file, the points associated with each entity are expressed in terms of the entity's own object coordinate system OCS. With OCS, the only additional information needed to describe the entity's position in 3D space are the 3D vector describing the Z axis of the OCS and the elevation value. Because ezdxf is just an interface to DXF, it does not automatically convert OCS into WCS, this is the domain of the user/application. And further more, the main goal of OCS is to place 2D elements in 3D space, this maybe was useful in the early years of CAD, I think nowadays this is an not often used feature, but I am not an AutoCAD user. Once AutoCAD has established the OCS for a given entity, the OCS works as follows: The elevation value stored with an entity indicates how far to shift the XY plane along the Z axis from the WCS origin to make it coincide with the plane that contains the entity.
Calculate the OCS rotation angle by converting the TEXT rotation angle in UCS or WCS into a vector or begin with text direction as vector, transform this direction vector into OCS and convert the OCS vector back into an angle in the OCS xy-plane see example, this procedure is available as UCS.to_ocs_angle_deg or UCS.to_ocs_angle_rad. For some entities, the OCS is equivalent to the WCS, and all points DXF groups 10–37 are expressed in world coordinates. See the following table. Coordinate systems associated with an entity type Entities Notes 3D entities such as line, point, 3dface, 3D polyline, 3D vertex, 3D mesh, 3D mesh vertex These entities do not lie in a particular.
03/08/2003 · Re: How to trans WCS to OCS ? I'm looking for the same thing see my posting DXF Codes 10 210 Formula. Unfortunately I always see the same types of answers.in AutoLISP. AutoCAD changes the coordinate system for some of its objects into an Object Coordinate System OCS, from a the usual World Coordinate System WCS. I have exported a drawing to a DXF file and are trying to analyse the data of some of the objects in it. I need the WCS coordinates, but the objects are in OCS. ; transform a point from WCS to OCS defun WCS-OCS pt trans pt 0 trans '0.0 0.0 1.0 1 0 t -- Autodesk Discussion Group Facilitator wrote in message news:5389209@discussion.. I tried various forms of trans function but all returns only the WCS coord. How can I return the point in the object coordinate system. see the. Wipeout group codes. Group code. Description. 100. Subclass marker AcDbRasterImage 90. Class version. 10. Insertion point in WCS DXF: X value; APP: 3D point. 20, 30. DXF: Y and Z values of insertion point in WCS 11. U-vector of a single pixel points along the visual bottom of the image, starting at the insertion point in WCS. The following image shows the 2D circle in 3D space in AutoCAD Left and Front view. The blue line shows the OCS z-axis extrusion direction, elevation is the distance from the origin to the center of the circle in this case 2.828, and you see that the x- and y-axis of OCS and WCS are not aligned.
Because of the nature of ezdxf as interface to the DXF format, the conversion from OCS and to OCS will not applied automatically, you always get the data that is written in the DXF file. You have to do this conversion manually tutorial , but most of the time this conversion is not necessary, because the default extrusion is 0, 0, 1 and for extrusion = 0, 0, 1 OCS and WCS are identical. When I know the circle center in WCS, and I want to write it in a.dxf file, I must know the value in OCS. First: Calculate the OCS. We know the x, y, z axis in WCS is: Wx 1,0,0 Wy 0,1,0 Wz 0,0,1 The origin of the OCS and WCS is the same. The z axis of OCS is the value of the "210 " "220" "230". 20/06/2014 · The Properties UI shows the point in UCS; the DXF code in OCS; but the AutoCAD.NET API returns the Circle.Center in WCS. AutoCAD internally stores Circle Center in its OCS Object Coordinate System or ECS Entity Coordinate System. This fact can be verified through getting the circle DXF list by some simple LISP expression. Its origin coincides with the WCS origin. The orientation of the X and Y axes within the XY plane is calculated in an arbitrary but consistent manner. AutoCAD performs this calculation using the arbitrary axis algorithm see Arbitrary Axis Algorithm. For some entities, the OCS is equivalent to the WCS, and all points DXF groups 10-37.
AutoCAD.NET: Matrix & Transformations – OCS ECS vs. WCS/UCS pt. 19 – Calculate Out Other Arc Values from Arc DXF Output We looked at various DCS flavors including Model Viewport DCS, Paper Viewport DCS, and Paper Space DCS PSDCS and performed almost all possible transformations among them, WCS, and UCS in the past. The following group codes apply to vertex entities. Vertex group codes Group code Description 100 Subclass marker AcDbVertex 100 Subclass marker AcDb2dVertex or AcDb3dPolylineVertex 10 Location point in OCS when 2D, and WCS when 3D DXF: X value; APP: 3D point 20, 30 DXF: Y and Z values of location point in OCS when 2D, and WCS when 3D.
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