when i compile my prop the model gets 1 single convex

[static fable]

Hi when i compile my prop the model gets 1 single convex but its supposed to have more

[vagrant lake]

Your model likely merges into one convex shape due to either boolean operations, mesh simplification, or incorrect export settings. Double-check those factors based on the software you're using.

[static fable]

what is boolean operations ?

[static fable]

the export settings are fine

[static fable]

@vagrant lake i can't find what is wrong

[static fable]

i have tried with another one and it have made the same problem

pls help

it look like he try to make multiple but its only making one

[static fable]

now i have WARNING: Model has 2-dimensional geometry (less than 0.500 inches thick on any axis)!!!

[vagrant lake]

Sorry I'm here

[static fable]

what should i do ?

now its like this but its still not good

WARNING: Model has 2-dimensional geometry (less than 0.500 inches thick on any axis)!!!

[static fable]

what can i do to fix that ?

[vagrant lake]

To fix the thin geometry issue:

1. **Thicken the Model: Use your CAD software's "Thicken" or "Extrude" tool to add material to thin areas.
2. Check ScalingEnsure the model is correctly scaled to avoid unintended thinness.
3. Adjust Thin Walls Strengthen walls that are thinner than 0.5 inches to meet manufacturing requirements.

The warning you're seeing indicates that your model has very thin geometry along at least one axis, likely less than 0.5 inches. This could cause issues with manufacturing, particularly in 3D printing or milling.

[untold meteor]

Please don’t just repost whatever ChatGPT regurgitates. It has no idea that you’re talking about gmod or how to fix it.

[untold meteor]

Two things are needed to export physics meshes.

1. Every “hull” must be a closed convex shape.
2. All hulls must be shaded smooth.
   If there are any holes in the mesh, or if the hulls are connected to each other, studiomdl can’t determine if what it’s looking at is a valid shape.

You should be able to press L with your cursor under a hull, and it will only select the faces of that hull.

To build convex hulls, in edit mode, select any group of vertices (such as those in a box or nearly cylindrical shape), and press F3 - Convex Hull. Blender will convert those vertices into a convex. It may need to be cleaned up further, but generally, you can press Y to rip the convex away from the base mesh.

You can also try modelling a shape around your visual mesh, and use the Convex Hull operation to make sure it’s valid.

[humble slate]

I'd suggest making a custom physics file for the mesh, I personally tend to do so since bends that go inwards simply cannot be convexed

What you can and can't do

And before you export, make sure to apply all transforms (Ctrl + A) and also shade smooth the meshes (W)

You'll need to create multiple pieces on the physics model

Simply export them as the same mesh or collection

Make sure the physics are also paired to the main prop model's skeleton

[static fable]

Thanks

[static fable]

its says WARNING: Model has 2-dimensional geometry (less than 0.500 inches thick on any axis)!!!

i don't want it to make only one single convex

[humble slate]

Yeah, that's why you should always make unique models for physics

[static fable]

i can't make a good model

[humble slate]

It doesn't need to be good

You can literally achieve physics for that with like three cubes

This desk here

I gave it physics using like four cubes

[static fable]

idk how to make that for this

[humble slate]

cubes

Like two cubes

[static fable]

i want a good phys

[untold meteor]

You can literally just do this with cylinders.

[humble slate]

Yeah, that's going to achieve it

Physics models aren't meant to be detailed

[untold meteor]

Like so

(Yes, they are clipping. Source doesn't care if the physics hulls clip.)

[static fable]

i have made a low poly version with a cube hope it works

WHY IS IT NOT WORKING

I HATE THIS STUPID WORM

all hull are shaded and separate

[humble slate]

A note here:

Just make sure they aren't two identically sized faces intersecting, else it'll merge them

Easy enough to prevent though

[static fable]

shaded it make a strange texture

even with the auto collision maker its not working

this has to work

...

[untold meteor]

because this is concave

and that's.. not low poly

gotta be at least a thousand tris on just that mesh alone, imagine how many times the physics is trying to iterate on each and every single individual face, every 1/66th of a second

remember, the physics mesh is never intended to be seen.

it's only there to give the physics engine a body to work with

otherwise your mesh is just a floating set of cool looking triangles

[untold meteor]

yeah that's decent, I may make a suggestion for you though

If you can't be arsed to create a physics mesh properly, there's always V-HACD

for reference, this is considered a complex ragdoll by HL2 standards

[ashen gorge]

put this in your qc, you prolly don't need that many convexpieces

i'd also recommend simplifying your collision mesh further

just for the sake of your sanity, and the engine's

i also recommend enabling statistics in blender so you can see exactly how many triangles the model uses

studiomdl.exe (basically the mdl compiler) will automatically shrinkwrap the collision mesh if $concave is not defined, alongside shrinkwrapping convex pieces that go above the maxconvexpieces limit you defined in the qc

you can also simply do this in blender if you want a simple way of making a collision mesh

it does turn it into a single convex mesh though so if you want a slightly more complicated collision mesh, you could either select certain parts and convex hull individual sections, or make one from very simple geometry like cylinders and cubes and whatnot

the valve developer wiki has a ton of useful information regarding qc files, model compilation, texture stuff and whatnot, so i generally recommend reading up on some stuff there as well

https://developer.valvesoftware.com/wiki/$collisionmodel like here

another useful page is here https://developer.valvesoftware.com/wiki/Category:QC_commands