Python ProjectPointToSurface

Hi,

I have some problems with ProjectPointToSurface using rhinoscriptsynthax.

when I put a direction as vector it doesn't consider the verse and compute the projection for both side of the ray. I would like to emulate the Point Project component in grasshopper.

any suggestion?

Attachments:

project tester.gh, 11 KB

Replies to This Discussion

Permalink Reply by djordje on November 29, 2014 at 9:11am

Hi GM,

Even though both rhinoscriptsyntax function rs.ProjectPointToSurface and grasshopper's component "Project point" sound like they do the same thing, they don't really as you have already experienced. The first one calls Intersection.ProjectPointsToBreps method, while the second one uses Intersection.RayShoot. Intersection.RayShoot method has already been implemented with rs.ShootRay rhinoscriptsyntax function but for it also adds the starting point of the ray to the final projected output list. So the best thing would be to call Intersection.RayShoot directly (check the attached file).

Attachments:

projecttester2.gh, 13 KB

Permalink Reply by GM on November 29, 2014 at 12:56pm

thanks djordje,

I can't use RhinoScript because the entire code has been write using rhinoscriptsyntax.

I tried the ShootRay method but It consider each planar surface as a plane. so it returns wrong intersection points. think I should try something else.

Permalink Reply by djordje on November 29, 2014 at 1:38pm

GM,

Did you want to say:
"I can't use RhinoCommon because the entire code has been written using rhinoscriptsyntax." ?

As I said, rs.ShootRay does call the Intersection.RayShoot method but unlike grasshopper's "Project point" component it adds the starting point of the ray too.

So if you do not want to use RhinoCommon methods, but rhinoscriptsyntax functions only, you could do it with a bit of work around: use the rs.ExtendCurve and rs.CurveBrepIntersect. Check the attached file.

Attachments: