Assignment 3 -- Due 3/27/08

Jonathan Hall

Problem 1:

Implement the Game of Life via a fragment shader rendering to Framebuffer Objects


Game of Life Set 1	Game of Life Set 2

(Click pictures for full view)

Problem 2:

This is a simple image processor. I implemented 3 filters, which are shown below. Each filter is implemented via one or more shader passes and can be applied on top of other filters.

Original Image >>	>> Median Filter >>	>> Luminance Filter >>	>> 7x7 Box Filter

The original image is a picture of a rose with high frequency noise added. The first filter applied is a median filter. This filter takes the median of a 3x3 region in each channel. This is effective in eliminating the high frequency noise of the first image. The next filter simply displays the luminosity of each pixel; this effectively turns the image black and gray. The last filter is a 7x7 box filter that displays the average of a 7x7 region. This was implemented with 2 passes, one in the X axis and one in the Y axis.

(Click pictures for full view)

Problem 3:

Using a geometry shader render the 'Silhouette' or contour lines of a model.


Contours using a geometry shader	Contours using a vertex shader

This should display the contour edges on top of the model. Since ATi does not support the openGL extensions for geometry shaders I have no image for using a geometry shader. To fudge a little I used a vertex shader to turn all non-contours black. This could have looked better if instead of black they where transparent, but then you wouldn't see that they are still rasterized. A geometry shader would remove the geometry.

(Click pictures for full view)