UDK road collisions

Flohock

Hello,

I'm working on an open world racing game in UDK. It's the first time I'm working on such a project and have a lot of questions about the specificities of road modelling. Anyway, the question I can't find an answer for at the moment is:

How to handle collisions on roads ? Especially in UDK.

I believe it's important for a racing game to have the most accurate collisions possible as all the gameplay is entirely based on physics. However I can't think of a decently cheap and accurate way to create collision meshes.

Here is , as an example the first prototype of road I made, as seen in 3ds max:



There is an S shape, with 2 main concave shapes, for the road, the low wall and the cliff. If I want to stay accurate on those shapes it would need an enormous amount of primitives. There might be a luge load of roads like this in the world in the end and I think it might be a critical hit on performance.

If you know a workaround for this issue that would be very awesome.

sprunghunt

you can turn on per-poly collision. It's good for ground sections like this. If you open up the static mesh properties in the content browser there are three checkboxes "use simple box collision" "use simple line collision" and "use simple rigid body collision" - uncheck these and you'll have per-poly collision. Don't use this on physics actors. Here's a video that explains it:

[ame="http://www.youtube.com/watch?v=RRPS811G8t8"]How to do Per-Poly Collision with Imported Meshes in UDK - YouTube[/ame]

Flohock

Thanks a lot sprunghunt ! I tried what you said and it works perfectly.