Slice Plane is Not Accurate in 3DS Max 2017

[Anonymous]

I am using a slice plane to remove the top half of two objects. I have tried using the same instanced slice plane as well as two unique slice plane modifiers. Both yield the same incorrect result. See attachment. 
1. The slice plane (positioned at world 0,0,0 and rotated 0,0,0)

2. Object being sliced correctly

3. Object being sliced by same slice plane, incorrectly.

the top surface of 2 and 3 should be sliced at the same place so the top is completely flat and coincident with the slice plane. I also notice that if I "remove bottom" instead of "remove top", the part of 3 that sticks up is reversed, so the surface of 3 ends up below the surface of 2.

I need to take a very accurate measurement of these objects at this precise slice and this error is preventing me from doing it.

Your post subject line has been edited by @hagen.deloss: Slice Plane is Not Accurate

[hagen.deloss]

Hello @Anonymous

Thanks for posting your question on the forums! great to hear from you again, sorry you are encountering this behavior, I hope I can help out.

Are you slicing 2 separate objects, or is this two parts of the same mesh? And are you using the quickslice tool from the modifier stack when in sub-object mode? Are you in an orthographic view?

I have seen some strange behavior with other slice tools, and the cut tool, but quickslice has always been there for me 😄

If it's still not working, can you us your snap settings to snap the vertices alongside the other vertices that are on the appropriate height?

I hope this helps! If not, please clarify further so I can best help you. Have a good weekend, talk to you soon!

Please select the Accept as Solution button if my post solves your issue or answers your question.

[JamesClarke3D]

My guess is your two different objects have two different transforms on them. In order to fluidly slice multiple objects, I can highly recommend a scripted solution based on Martin Breidt’s gizmoControl script. It ‘links’ the gizmo of a modifier (in your case Slice) to the world position/rotation of another object. Do this on both of your objects to the same control object, and you can control the slice position anywhere, regardless of where/how your source or control objects are transformed.

[Anonymous]

I am using the slice modifier on two separate objects. I tried using it both as a instanced modifier on both object and I tried using a separate slice modifier on each object. For some reason, on the one object, the slice modifier "refuses" to slice at the correct location. Yes, I am in an orthographic view and I set the location of the slice planes numerically (0,0,0 and no rotation). The slice plane itself appears to be in the correct location, but it is not slicing the object in the correct location.

Isn't Quick Slice a permanent modification of the geometry? I wanted to use a modifier because I need to be able to turn this slice on and off.

My work around is to move the slice plane down until the slice is in the correct place (or as close as I can get visually.)

[hagen.deloss · Accepted solution]

@Anonymous

I would guess that the axis of one of the objects is different somehow. I would suggest the following.

• export the original mesh as an OBJ
• import it into a new scene
• instance it and seeing if you get the same results with the same tool 

I would also suggest creating a blank scene, and creating 2 boxes and adding a slice modifier to one, and seeing if the behavior is replicated, that way we can narrow down to see if the issue is with your geometry or the tool itself.

I can also take a look at your file if you want to attach it to your next reply, or you can send it in a private message using a file sharing service.

Just to make sure we are talking about the same tool, here is how my Slice Modifier behaves on a box mesh.

Let's see if any of that works and troubleshoot further if not, talk to you soon

Please select the Accept as Solution button if my post solves your issue or answers your question.

[hagen.deloss]

Hi @Anonymous 

I was wondering if you had a chance to revisit this issue, or try out my suggestions? It would be super helpful if you could add a post with how you decide to proceed, and your results. That way other Community members can benefit from your process

Please hit the Accept as Solution button if a post or posts solves your issue or answers your question.