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Activity Forums Adobe After Effects Expressions simulate 3d Yrotation on a 2d rectangle created with createPath

• # simulate 3d Yrotation on a 2d rectangle created with createPath

Posted by on December 20, 2022 at 4:26 am

hello!

This has probably been discussed before, but I have not been able to find the answer.

Using createPath with this expression, I am following a 3d null called “3dNull”. Everything works great

My question is, would it be possible to somehow modify it so that the rectangle created via createPath is always 90º relative to the Y axis of the null it follows? It would be like creating a plane perpendicular to the Y rotation plane of the null, but I don’t know if it is too tricky to work with the 4 vertices of the shape being purely 2d.

Thank you very much in advance!

`L=thisComp.layer("3dNull")R=L.sourceRectAtTime(time,false);UL = fromCompToSurface(L.toComp([R.left,R.top]));UR = fromCompToSurface(L.toComp([R.left+R.width,R.top]));LR = fromCompToSurface(L.toComp([R.left+R.width,R.top+R.height]));LL = fromCompToSurface(L.toComp([R.left,R.top+R.height]));createPath(points = [[UR[0],UR[1]],[LR[0],LR[1]],[LL[0],LL[1]],[UL[0],UL[1]]]], inTangents = [[0,0],[0,0],[0,0],[0,0],[0,0]], outTangents = [[0,0],[0,0],[0,0],[0,0]],[0,0]], is_closed = true);`

2 Members · 2 Replies
• 2 Replies
• ### Dan Ebberts

December 20, 2022 at 7:17 am

I’m not 100% sure I understand what you’re asking for, but it might be something like this:

`L=thisComp.layer("3dNull");R=L.sourceRectAtTime(time,false);UL = fromCompToSurface(L.toComp([0,R.top,R.left]));UR = fromCompToSurface(L.toComp([0,R.top,R.left+R.width]));LR = fromCompToSurface(L.toComp([0,R.top+R.height,R.left+R.width]));LL = fromCompToSurface(L.toComp([0,R.top+R.height,R.left]));createPath([[UR[0],UR[1]],[LR[0],LR[1]],[LL[0],LL[1]],[UL[0],UL[1]]], [], [], true);`
• ### Juanluis Vich

December 20, 2022 at 9:40 am

oh! that works!!
thank you so much for the solution! i had started trying complicated matrix transformation options and had lost sight of the big picture!

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