Maxscript - objA.object_rotation from objB.face_normal

Submitted by shiro on Tue, 2015-04-21 04:15

Hello there!

Workflow:
1. imported targetObj (cube, poly, *.obj)
2. on-scene sceneObj (cube, poly, later point helper)
3. sceneObj.rotation = targetObj.rotation (the two cubes need to overlap)
3. sceneObj.pos = targetObj.pos

Problem:
Can't set proper axis / rotation to sceneObj from face normal of targetObj. Transformation nooberism.

Details:
I'm working on a simple import plugin, that imports custom mesh from another app into 3ds Max. In the 3ds Max scene I have a helper (a cube for testing right now) and I need to fit the position and rotation to another one (same size, 6 polys) which is imported. This proves to be extremely difficult for me, and while the position is no problem at all (sceneObj.pos = targetObj.pos) I'm totally lost at matrix3, eulerangles and quat values. And (sceneObj.rotation = targetObj.rotation) is not an option, as the simple imported *.obj file has NO rotation at all.

So - I've thought that getting the matrix3 of the normal of face 3 (front face) of the targetObj. I managed to somehow translate the rotation to my scene object but I think the axis are all wrong - some of them keep the sceneObj aligned properly, while when targetObj orientation changes it rotates the sceneObj in the wrong direction / along wrong axis.

Code:

fn getAngleFromNormal targetObj sceneObj =
(
    --RESET sceneObj ROTATION
    oldTranslateMtx = transMatrix sceneObj.transform.pos
    oldScaleMtx = scaleMatrix sceneObj.transform.scale
    sceneObj.transform = oldScaleMtx * oldTranslateMtx
    mtx = matrixFromNormal (polyOp.getFaceNormal targetObj 3)
    sceneObj.transform *= mtx
    eu = mtx as eulerangles
    rx = eu.x
    ry = eu.y
    rz = eu.z
    sceneObj.rotation *= inverse (eu as quat)
    sceneObj.pos = targetObj.pos
)

Screenshots:
http://i.imgur.com/XHDe9ic.jpg
http://i.imgur.com/89LRbv9.jpg
http://i.imgur.com/cA0YU5D.jpg

I'm really, really hopeless if it goes for things such as these, so I'd appreciate any and all help that can direct and teach me even a bit.

Thanks for your time,
Michelle.

AttachmentSize
direction_1.jpg157.03 KB
direction_2.jpg140.27 KB
direction_3.jpg128.28 KB
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pixamoon's picture
Submitted by pixamoon on Wed, 2015-04-22 21:04.

`

hey,
try this :

fn getAngleFromNormal targetObj sceneObj face =
(
    sceneObj.transform = matrixFromNormal (polyOp.getFaceNormal targetObj face)
    sceneObj.pos = polyOp.getFaceCenter targetObj face
)
 
getAngleFromNormal $Box001 $Box002 5

Found it here:
http://forums.cgsociety.org/archive/index.php/t-337793.html

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