Tuesday, February 12, 2013

The Apex Observatory is finally finished!

Finally finished this gosh darn thang. Still lots of room for improvement and things I want to add and tweak, but it's time to move on.

The scene was designed with a point and click adventure in mind, so this is the angle it would appear in game. I laid it out in a way so that they player would always be visible. The general idea is that you take the lift up there and try to convince the hermit astronomer who lives up here to help you.

Here's the hero prop himself, the telescope. Once I got a cubemap of this environment baked down it fit in the scene much much better. There are still some stylistic clashes that I want to touch up on, like the wood, but that will be later.

Here are some simple sketches I did to work out some of the designs and layout.

Now let's talk technical art! :D

The whole scene uses five materials. One unique material for the telescope, and 4 modular materials that are instanced across the rest of the assets. I have one basic diffuse/normal/spec material, one metallic material, one window material and one foliage material.

This is the basic material, and as the name implies it's fairly basic. It has two parameters to control the specular strength and the glossiness of the asset as I find those always require a lot of tweaking. The Material Function is a simple setup to control the U and V tiling separately and I made it into a function because I found myself using it a lot over different materials.

The metal material is just the basic material with a cubemap added on top of it. Instead of just multiplying the cubemap right on top of the diffuse I use Fresnel as a mask into a Lerp node so the reflections are stronger at a glancing angle, which mimics how reflections work in real life. I also have a Reflectivity parameter that simply fades it out for a more subtle look.

The telescope material is similar to the metal material, but with some added effects for a spesific look. Looking around for tips on metal materials I found what some called a "car paint" effect, and i liked the extra boost it gave to the highlights. I'm also adding the cubemap and car paint effect to the emissive. The metal material originally had this as well, but I didn't like the look of it on the other assets.

For the foliage I had to rebuild the lighting because I was using custom vertex normals on the alpha planes. I also added a parameter to control the diffuse brighness to lighten the shadowed areas.The reason I did this is because I changed the Lightmass settings to give a much brighter and colorful look, but the foliage is dynamic and don't recieve the same indirect lighting. Some fine tuning is needed since the leaves turned out extremely bright in some shots.
It also has a simple sine wave in the WorldPositionOffset to give it the look of rustling in the wind. Vertex color is used to mask the weight of the wind for a less uniform look. I decided to go for a simple setup like this rather than deal with WindDirection actors because the scene was so small and only had a few assets it effected.

The first couple of attempts at the tree didn't turn out good at all so I took a close look at how the Airbørn team did their wonderful foliage, and I discovered that they just had a ton of alpha planes scattered on a mesh with a tiling texture. Super efficient and gives really nice looking results. Using a script I was able to mash this together in 5 minutes. The central mesh also helps deal with overdraw.

Now to round this off here are some things I learned from doing this:

  • Don't overthink stuff. The simplest solution is often better and will save you a lot of time. The first iteration of this environment fell apart because I was getting too elaborate with the modularity and materials, which resulted in a slow and unsatisfying workflow.
  • Have a plan. The biggest mistake I did was to jump into this without a clear piece of concept art and an asset breakdown/list. Since I winged a lot of the designs as I went along most of the stuff in this scene went through several iterations before I got a result that worked out. This was a big waste of time and I could have finished in half the time if I had spent more time planning ahead of time.
  • Use lots and lots of material instances. In the beginning I kinda rushed through the process and had a unique material for every asset because I didn't really care about performance. But as soon as I cleaned up my scene and instantiated my materials it became immensely easier to do tweaks for each asset, and having them all draw from the same parent made updating and adding to them much faster.
  • Use more scripts. This is something I already know and need to work on, but it bears repeating. Using scripts and shortcuts for even simple stuff speeds things up immensely. If something usually takes 3 steps and you can reduce it down to 2 you've just sped yourself up by 33%! I still prefer doing some things by hand. Automation can only take you so far, there is no good make art button.
  • Take breaks. There were parts where I was so sick of this environment and strongly considered scrapping it because I felt it wasn't going anywhere good. This was usually after working a whole week straight on it with no breaks. After stepping away from it fora few days and doing something different like the Art Jam I was able to return to it with new vigor. But aside from big breaks like that taking small ones during the day are important too. I started experimenting with the pomodoro technique which means I have a timer running and every 25 minutes I'll take a quick 5 minute break and step away from the PC. I'll go outside, do the dishes, make a cup of tea. Anything that's not in front of the computer. When I return I've reset my mind and work more efficiently because it eliminates the habit of getting caught up in small details and gives you a chance to think about the problem at hand. And my room has never been tidier. :p It's probably not for everyone, but I recommend everyone give it or at least some variant of it a go.

And in general I learned a TON of technical stuff about UDK and game engines in general, lots of material tricks, some neat sculpting workflows, NDo2 and DDo, and how awesome the Polycount Google hangouts are for productivity and learning. Thanks guys!


Johan said...

Awwww yeeeh!!! Ser fantastisk ut!

Tom said...

Looks great! I love the style of the scene, shading on the material has a good feeling as well.