im placing a object on where pickpoint. positios perfect but im unable to get proper rotation anybody has solution? decal is not solution

[image] Position Plane along the surface of picked point white_question_markQuestions I am trying to move a plane to the clicked point but it should rotate parallel to the picked surface (wall/roof/ground). For example, imagine a hanging painting on the wall. …

why somuch complicated method to get a rotation from normal

https://www.babylonjs-playground.com/#14VWOV#14 please checkit when i click on side wall plane rotation is weird. i need only y rotation value to hang a paint on a wall

@Vijayxd totally agree: too many complications going on here. Initially I assumed the geometry is bad so I scolded the 3D artist, well, actually I checked the vertex normals in Inspector. Geometry is ok. So I checked the src code of getNormal and found the normal is negated in some cases, like this…

Adding @bghgary who worked on this recently :slight_smile:

See this thread for the context on why we added this. @Jo_Mantelers Can you explain your scenario in more detail? Maybe also provide a PG if possible. Are you trying to pick a mesh from the back face?

No, I don’t want to pick the backface. Some meshes just fail to produce correct normals, even though the face/vertex normals are correct. As stated, it depends on the dot product of normal and pickinfo.ray, i.e. camera . Here a PG: when you move the mouse and stick is yellow, the normal is valid, wh…

Thanks for the repro, this PR will fix the problem: Ray picking: Fix flipping of the normal when calling getNormal BabylonJS:master ← Popov72:raypick-fix-back opened 05:10PM - 20 Nov 22 UTC (UTC) …

Ahh, yes, my change was comparing two vector in different spaces. Sorry for the troubles. Thanks @Evgeni_Popov for fixing. :slight_smile:

How to get correct rotation value from pickinfo.getnormal()

Questions

Raggar September 19, 2020, 10:18am 2

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How to get correct rotation value from pickinfo.getnormal()

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