Closest point on the primitive

[zzangxx]

I want to find the closest point on the primitive from one critical point using HDK.

Actually, it is easy to solve this problem( using the class : MMeshIntersector MPointOnMesh, function : getClosestPoint ) in Maya API.

Is there any similar class or function(GEO type)?

Edited February 21, 2011 by zzangxx

[Scot Shinderman]

zzangxx,

there are some routines available in GU/GU_RayIntersect.h (w/ GU_FIND_CLOSEST)-- it looks like it takes a GU_Detail so I guess it would have to populated one primitive at a time. Perhaps there's a more incremental function version out there?

-s-

[zzangxx]

zzangxx,

there are some routines available in GU/GU_RayIntersect.h (w/ GU_FIND_CLOSEST)-- it looks like it takes a GU_Detail so I guess it would have to populated one primitive at a time. Perhaps there's a more incremental function version out there?

-s-

Thank you for your response.

However, I already saw that header. It include some functions that is sendRay,minimumPoint, proximityPoint and so on.

That function's return value is int type. I want to know the closest point on the primitive (input : primitive , one point // output : closest point).

How can I use that?

Edited February 22, 2011 by zzangxx

[petz]

Thank you for your response.

However, I already saw that header. It include some functions that is sendRay,minimumPoint, proximityPoint and so on.

That function's return value is int type. I want to know the closest point on the primitive (input : primitive , one point // output : closest point).

How can I use that?

use GU_RayIntersect::minimumPoint()

this stores the closest primitive with uv values of the clostest point in GU_MinInfo::Prim.

then you have to use GEO_Primitive::evaluateInteriorPoint() which returns the actual position of the closest point as UT_Vector4.

hth.

petz

Edited February 22, 2011 by petz

[zzangxx]

Thank you so much~!!