Tag Archives: Rendering

Designing a Functional Rendering Pipeline

Well, it’s been ages since I last blogged anything. I feel ashamed… It’s been quite busy on my end. I’ve had plenty of projects to work on.

There’s a bright side to all this – I now have two more languages solidly under my belt! The first is C++, which is something I’ve only had really basic knowledge on up until now. I’ve been neglecting it mostly because it sucks, but it’s become a lot easier to stand now that the new version is finalized. Glory be to lambdas on high!

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Screen Door Shadow Mapping

I developed this technique 2 or 3 years ago to solve one of the main issues with shadow mapping: transparency. The only other solution I had heard of at the time was Deep Shadow Maps, which didn’t seem like something that could be done in real time.

It’s a really, really simple idea. First, render the shadow map, drawing semi-transparent objects with screen door transparency. Apply some softening to the shadows, and voila. Of course, there are two major drawbacks.

  1. It’s still noisy, unless you use a massive filter.
  2. The only softening technique that works is PCF. VSM (and possible ESM) doesn’t work because the method naturally creates big depth discontinuities, and the conventional fix for light bleeding eliminates the transparent effect.