topic How to get the (2D) projection of a solid? in ObjectARX Forum

How to get the (2D) projection of a solid?

maisoui — Fri, 16 Jan 2015 09:04:21 GMT

Hi,

After several tests / research, I still can not correctly calculate the (2D) projection of a solid. For example, I want to obtain a circle/ellipse for a sphere (with or without obscured lines) (something similar to command FLATSHOT). I tried to use Brep API, but without success (execution time very very long or eDegeneratedTopology error).

My goal is to display any projection of a given solid in a custom entity. Perhaps there is a simple way in subWorldDraw or subViewportDraw?

Several posts in the forum talks about the same topic, but were never answered.

Any suggestions are welcomed. Regards,

Re: How to get the (2D) projection of a solid?

dgorsman — Fri, 16 Jan 2015 23:03:55 GMT

I *think* what you're looking for is the HLR API (hidden line removal).

Re: How to get the (2D) projection of a solid?

maisoui — Mon, 19 Jan 2015 08:55:51 GMT

Perfect. This is exactly what I was looking for. After reading the few Hlr examples that come with the API, I was able to implement a 2D projection of a solid, and it computes fast.
Many thanks for your help.
Regards,