In the previous post about roads in Outerra I mentioned that different road types can be created by using road profiles. Here comes one example.
Dirt roads are using the very same mechanism as normal roads, in fact the only difference is that road nodes here contain a different road type identifier. That is used to look up the corresponding road profile in shaders that generate the roads, and it determines other things as well - the pavement and border materials, for example.
Road profile specifies "exactness" values across the road width, in range from 0 to 1. Normal roads have value 1 across the whole road width, meaning that the elevation given by the road spline interpolation is exact and the resulting surface will be smooth and level. Values less than 1 will cause that the computed surface elevation is blended with the actual underlying terrain elevation with given blending coefficient. Additionally, the less exact the road surface elevation is, the more it is randomized by fractal to make it rougher.
The roughness created by the fractal noise can vary with the road type. The depth of the furrows can be determined by setting road surface under the terrain by a specific amount, and it can change node by node. On the sample road above it creates deeper or shallower parts. Or even a ridge when the way points are not set densely enough to follow the terrain accurately.
Here is a road that was created from way points lying 0.4m (on average) below the terrain surface with high roughness:
Another one that was put only slightly under the terrain and the roughness is low:
Lastly, few screen shots how it all looks in the terrain.
In order to utilize the generated detail we also set a finer level to be used for vehicle physics. In the previous video with Tatra truck the resolution for physics was around 1.2m, and it was quite visible. In the following video the resolution for physics is around 0.15m, 8 times better. The wheels are simulated as simple ray casts so it may be occasionally visible. Also, Angrypig toyed with the suspension and I left it in for the video; Tatra truck now sways way too much, but at least it serves to show the response to the terrain shape.
Forum topic here.
My mind is blown away, this looks incredible! I could watch this volume-less video all day and be amazed by the physics the terrain creates with the vehicle.
more than amazing!
BTW, trees is sprites?
I want to see the Tatra supercar (sportscar) in the next demo ;)
Seriously amazing! Sorry about me comparing it to Arma or OFP all the time, but the driving already looks better than in those games.
The driving and physics are laughable within Arma 2.
Woops, by the way this engine looks amazing!
You might want to differentiate the trees a bit.
this is starting to look even better than Arma2's engine. Amazing work, can't wait to see what comes next.
I want a game running on this engine NOW! I love the huge landscapes.
Will this engine work with Shooter games? because a shooter set in a large scale landscape like this would be awesome. Like ArmA!
Awesome job!
On the first two screens, the road looks like it was made by a colon of tanks. For a forest road, you should make it half as deep. Also, the physics are looking great.
Oh, and why are all comparing this to Arma? This is far SUPERIOR to it.
Will grass and other vegetation become 3d models close up? If so, that would be much superior to any other game engine, with that little tweak (in my mind).