.Ray a small raytracer in C#

About

Dotray is not so stupid raytracer. It compiles and works on .net and mono platforms. Written in order to test managed code performance.

Features

mgf, the materials and geometry format for scene description

custom xml for camera position, rednering size and so on..

ppm output only so far, viewable in programs like GQview and GIMP

Some renderings

Renderings are converted to 24bit png. Click to see bigger version.

Download

Remeber, you will need .net framework (only).

Download source of dotray-0.1 from sourceforge

Usage

On mono platform

$ mono dotray.exe SceneConfig.xml

On windows

dotray SceneConfig.xml

Notes

It works slow, on mono even slower. Here are some time results:

Tokugawa's Gentoo

$ cat /proc/cpuinfo
...
model name      : AMD Athlon(tm) XP 2500+
stepping        : 0
cpu MHz         : 1836.386
cache size      : 512 KB
...
$ mono dotray.exe office640x480.xml          
Parsing:        0.093842 s                 
BSP:            1 m 42.703976 s
Objects:        10085
Voxels:         2490
obj/vox:        4.05020080321285
Rendering line 479 of 479
Rendering:      41.222566 s

Laoo's Windows

D:\>rem AthlonXP 1800+, Mhz 1534

D:\>dotray office640x480.xml 
Parsing:        0,0625 s
BSP:            5,375 s
Objects:        10085
Voxels:         2490
obj/vox:        4,05020080321285
Rendering line 479 of 479
Rendering:      28,28125 s

As we can see mono 1.1.3 is 19 times slower in BSP building, and only 1.45 times in rendering! Where is the difference? I hope that mono guys will know.

There is another thing. Pictures generated on .net and mono looks the same, but... they aren't. I suppose these are some floating point misunderstangins.

.Ray