Since I mention the benefits of rendering images as single-light layers on the GIMP page, today I thought I’d share some sample images and the final product using this technique.
The problem with rendering complex scenes with multiple lights is that the software has to take into account the interaction among all the lights. The computer’s task is much simpler with a single light. That’s how I took render time from 30 hours to three hours on this image of a scene created in Poser, and rendered in LuxRender via Pose2Lux. In addition, I was better able to control the impact each light had on the final scene.
In LuxRender, you can separate lights into individual groups and post render control each group’s intensity and, to a lesser extent, color, which is great. But, as noted, it took 30 hours to generate my first high quality go at the image, and it wasn’t quite right. I really didn’t want to go another 30 hours. With only one light, each sub-image only took an hour. TADA!
So, I had LuxRender generate three separate images, each with one unique light. By then loading the separate images into GIMP, I had much greater control of color and intensity, and could even have added effects like fog if I had wanted.
As noted on the GIMP page, I got this tip from Waldemar Belwon, the source of quite a bit of graphics/3D/animation wisdom. Check him out.
These images were originally generated as quite large PNGs. In the interest of efficiency, they are posted here as JPGs. (If you don’t know the difference, wikipedia will tell you all about image file formats).
Here are the three images, each rendered with a different light, and the final image generated via GIMP: