prerogative

Author Topic: Manual concave hull  (Read 770 times)

NG

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Manual concave hull
« on: March 19, 2018, 08:22:04 PM »
Why can't I just make a simple poly and select that as the hull? The exporter fiddles with it and I can't prevent it.

wallworm

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Re: Manual concave hull
« Reply #1 on: March 19, 2018, 08:27:38 PM »
You have to provide more information. You can assign your own hulls all you want. You must explain the steps you are taking, as I've never had a problem setting a hull to anything I choose in all the years WW has existed.

NG

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Re: Manual concave hull
« Reply #2 on: March 19, 2018, 09:13:47 PM »
I modelled the hull from primitives, converted to poly and selected that as the hull. Some parts if it is concave and right, but another is convex. It's the same object, it makes no sense.

wallworm

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Re: Manual concave hull
« Reply #3 on: March 19, 2018, 09:31:39 PM »
It makes plenty of sense once you understand how hulls are generated. Remember, studiomdl.exe will always create a convex wrap around any Element of a concave hull mesh. If your hull Element is concave, (which you can see that the highlighted RED is one element in Max and is Concave in attached image), it will turn into a convex part. To make that wrench wrap more closely, you need to split it into two convex Elements. See where I split it? Before splitting that element would become wrapped where the dotted green lines are. After split, it becomes more of what you expect.

This isn't a Wall Worm issue. Wall Worm is not changing your hull. It's studiomdl.exe (the program that compiles the models) that will always do this in a very predictable way to any concave element. In the end, each piece of the hull must always be CONVEX. In source, a "Concave" hull is actually a collection of CONVEX hulls.
« Last Edit: March 20, 2018, 09:14:48 PM by wallworm »

NG

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Re: Manual concave hull
« Reply #4 on: March 19, 2018, 09:38:52 PM »
Right, I was splitting the model into elements instead of the hull..  :o

It works perfect <3
« Last Edit: March 19, 2018, 09:40:59 PM by NG »