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Not able to scale down physics boxes in PhAT

I try to create physics assets in PhAT for my vehicle. I need some flat boxes but the boxes have a minimum scale.of ca. 30cm in all dimensions. Also spheres and sphyls have this large minimum size. Is there any way to reduce the size?

UE 4.8.3 Launcher Version

Product Version: UE 4.8
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asked Aug 27 '15 at 09:36 AM in Using UE4

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avatar image Slavq Nov 24 '15 at 04:21 PM

I have the same problem. 4.10.

avatar image NoahBeggs Jan 10 '16 at 01:52 AM

Would also love to have a solution to this

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3 answers: sort voted first

I know this is an old question but what helped me was, increase the scale of the model and bones in the 3d application.

In Blender, changing the "Units" to "Metric" and changing the "Unit Scale" value to 0.01, then increasing the size of my model with the bones, helped tremendously.

Unfortunately, I don't know how to solve this issue with 3ds Max or Maya.

Hopefully, that helps someone in the future.

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answered Sep 06 '17 at 10:38 PM

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Int he Phisic Asset View RIght panel, Body Setup > Capsules> Members array that you need to expand > Radius - from 0.5 to 0.1. Scale as you need.

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answered Feb 28 '19 at 04:09 PM

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MostHost LA
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avatar image Mathias TML Mar 01 '19 at 07:31 AM

Yes this is easy since UE 4.18 but in previous versions it was not possible.

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Actually, I do have a couple solutions for this, though it's a bit less direct than simply scaling the physics bodies as desired.

Solution 1: Add a bone (or use an existing bone) which affects the vertices you wish to encompass with a physics body. Adding a physics body for this bone will usually create a shape which tightly fits the vertices which the bone affects. Using this method requires no further scaling though, as scaling it will automatically snap the newly created physics body to the minimum size you mentioned in your question (30cm, I believe).

Solution 2: Right click on a physics body and choose "Use collision from static mesh." Doing so allows you to use the collision bounds of any static mesh as a physics body (or group of physics bodies). These can all be scaled to your heart's content.

Cheers, -Noah

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answered Jan 10 '16 at 06:31 AM

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