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Pastimes : Dream Machine ( Build your own PC )

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To: Spots who wrote (2096)	8/23/1998 6:38:00 PM
From: Zeuspaul	Read Replies (1) of 14778

DOS 3D viewing mode Yes it is a DOS application. It is a CADD application. The first process is a linking process. Each data point has an xyz coordinate. The program randomly draws vectors between the data points and creates a Triangulated Irregular Network TIN also known as a Digital Terrain Model DTM. From this model one can create contour maps and cut cross sections and... The entire program runs in RAM. If a project is larger than available RAM the project will not load. The program has its own memory manager and can make use of 512+ MB of RAM. I do not know the theoretical max. The machine came with NT and 385 MB RAM. I converted it to Win95. I run the program with the shut down/start up in MS DOS mode. The initial linking process is faster with the Compaq PII 333. I have not run any time tests yet. The slow process is the 3D viewing mode. This is a visual representation of the TIN model. One views a series of color coded links. It would be similar to a representation of the earths surface constructed with tooth picks. One rotates the view and exaggerates the view with the arrow keys on the keyboard. As one rotates the model each link must be recalculated. The project I was working on had 25000 data points. Before we go to far with this I will have to get better data. I will try the identical project in the IBM Pentium 166. The machines are at work and I post from home. The program has always worked faster as we have progressed from 386 to 486 to Pentium. Video drivers have played a significant role speeding up the program. The video drivers are provided by the software vendor not the video card manufacturer. The computer has a Matrox MII with 16 MB RAM. I have to use an old VESA driver as the software manufacturer no longer upgrades the DOS version of the program. Zeuspaul

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