Gimp Animation Package Onion Skinning

The following is from

Re: [Gimp-user] GAP Onionskin Question

Thu, 23 Oct 2008 21:14:46 -0700

I have some comments on Bhaaluu’s onion-skinning tutorial which is
included at the end of this message.

Step 9 instructs the user to perform a “File->Open” the second frame
(f_000002.xcf). When using GAP, you should not use File->Open to
navigate frames; use one of the commands: “Video->Go To” (which is
useful to assign keyboard shortcuts), “Video->Playback” (which
provides some nice “scrubbing” functionality), or “Video->VCR
Navigator” (which provides easy cut-n-pasting of frames). Not only
will the operation take much less time, but some operations depend
upon GAP managing the displays. Step 9 should instruct “Video->Go
To->Next Frame”.

Continue reading “Gimp Animation Package Onion Skinning”

Blender Cycles

I learned about radiosity sometime around 1996. The first program I used that could light a scene with radiosity was called POVRay. To get it to work you had to set up a whole lot of parameters just right. A few years later I illegally downloaded a copy of Maya. Maya could light a scene with radiosity, (called global illumination). Here again you had to set up a whole lot of parameters just right to get it to work. Besides, I didn’t like downloading software illegally. Then I discovered Blender (free software), but it could not render with radiosity. In 2009 I came across LuxRender. LuxRender will take a scene you’ve created in Blender and render it with beautiful radiosity and physically based materials. It was pretty easy to set up. You just assigned different materials to your objects, create an object which will serve as your light and export your scene using the LuxRender plug-in. Around December 2011, Blender released version 2.61 which included the Cycles render engine. Finally I could render with radiosity without having to export or tweak a lot of settings. Also Cycles allows you to interact with your scene while it renders with global illumination. Every time you make a change it immediately updates the lighting. Like LuxRender, Cycles starts with a very rough approximation of the finally result. As it continues to process the scene the quality gets better and better. For some scenes you may have to let Cycles render for hours and hours to get a good quality result, but boy do I love the results.

Below is a typical Cornell Box rendered with Blender Cycles. It took about an hour to render.

Here is a video of a camera turning around in a room lit by the sun coming through the window. I wanted to complete the render in less than eight hours so I kept the quality very low. Each frame has a quality of 60 samples. For comparison, the Cornell Box above was rendered with a quality of 8,000 samples.