Find the closest point on mesh

[illunara]

Hi everybody
Maya already had closestPointOnMesh node to do it, but i don't know how it working from inside. Any chance  to read the source of this node?

Anyway, i try to write one using openMaya, but its not working either, here is the code. Please tell me where it goes wrong. Thanks

https://gist.github.com/illunara/4a456d1407f9f60a1089

[Eduardo Grana]

Hello Illunara,

Haven't done this for a while, but i remember using

from MFnMesh the getClosestPoint function instead,

not sure if this is what you are after...

MStatus getClosestPoint	(	const MPoint &	toThisPoint,
		MPoint &	theClosestPoint,
		MSpace::Space	space = MSpace::kObject,
		int *	closestPolygon = NULL
	)		const

I cant find the code where i used it,

I'll keep looking...

Cheers,

Eduardo

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[Tuan Nguyen]

Hi Graña

I tried, and fail too. The result is on mesh's surface, but clearly not the closest point :(

[Eduardo Grana]

Hello,

I've made this simple test,

http://pastebin.com/6xtHkt7t

Hope its usefull, otherwise let me know.

Be aware that is with python api 2.0, and you cant mix it with regular

python api. I used it to avoid the pointers that are a little bit messy...

Cheers,

Eduardo

On Thu, Dec 4, 2014 at 2:45 PM, Tuan Nguyen <cb.il...@gmail.com> wrote:

Hi Graña

I tried, and fail too. The result is on mesh's surface, but clearly not the closest point :(

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[Tuan Nguyen]

First of all, it works, thanks a lots, and for telling me about python api 2 too :D

Just a little confuse about MSpace, i used MSpace::kObject, but lately,it got multiply with mesh's matrix, so they should be identical, right?

[Chad Vernon]

If you are calculating many closest points, you should use MMeshIntersector as it will be a lot faster.

[Tuan Nguyen]

Hi Chad

I attach the code using MMeshIntersector in the first post, but the result gone wrong :(
can you take a quick look at it please?

[Eduardo Grana]

Yes, it should be the same, although I don't know how MMeshIntersector handles spaces.

On Thu, Dec 4, 2014 at 4:04 PM, Tuan Nguyen <cb.il...@gmail.com> wrote:

First of all, it works, thanks a lots, and for telling me about python api 2 too :D

Just a little confuse about MSpace, i used MSpace::kObject, but lately,it got multiply with mesh's matrix, so they should be identical, right?

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[Chad Vernon]

You're passing in the wrong matrix.  You don't want the inverse you just want the inclusive matrix :

 

mat = meshPath.inclusiveMatrix()
resultPoint = om.MPoint()
polyIntersect = om.MMeshIntersector()
polyIntersect.create(shape, mat)
ptON = om.MPointOnMesh()
polyIntersect.getClosestPoint(pt, ptON);
resultPoint = om.MPoint(ptON.getPoint().x, ptON.getPoint().y, ptON.getPoint().z)

[Tuan Nguyen]

Thank Chad, it works beautifully :D

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[igo rov]

Hi , I know its a old post...but how to you get the world position of the point which is MFloatPoint, 3d Point in objects space?

Am Freitag, 5. Dezember 2014 05:42:18 UTC+1 schrieb illunara:

Thank Chad, it works beautifully :D

On Fri, Dec 5, 2014 at 6:40 AM, Chad Vernon <chadv...@gmail.com> wrote:

You're passing in the wrong matrix.  You don't want the inverse you just want the inclusive matrix :

 

mat = meshPath.inclusiveMatrix()
resultPoint = om.MPoint()
polyIntersect = om.MMeshIntersector()
polyIntersect.create(shape, mat)
ptON = om.MPointOnMesh()
polyIntersect.getClosestPoint(pt, ptON);
resultPoint = om.MPoint(ptON.getPoint().x, ptON.getPoint().y, ptON.getPoint().z)

On Thursday, December 4, 2014 12:56:20 PM UTC-8, illunara wrote:

Hi Chad

I attach the code using MMeshIntersector in the first post, but the result gone wrong :(
can you take a quick look at it please?

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