3d to 2d

TWD · 21st Feb 2002, 01:17 PM

I have created a 3d render program for my TI86. It can do all the rotations and stuff like that. It will make the cube rotate in space.

Currently I take the x y z positions and I just ignore z and it graphs x and y. This of course doesn't give you a perspective. All I want to do is make a cube that I can rotate, I'm not even doing translations. The cube always stays in the center.

Twisted Metal · 21st Feb 2002, 03:19 PM

uhh thanks for sharing

Make a falldown clone game

Elrod · 21st Feb 2002, 03:24 PM

Without being able to test it in front of me, I'm not certain this will work, but I believe if you multiply the x and y values for each vertex by a factor determined by (z+n)/n where n is some arbitrary factor for the amount of perspective distortion you want, you'll get what you're looking for. n should be large enough that your lowest z value will still result in a positive number, and the higher the value of n, the less distortion there will be - adjust to preference. This method only works if your 'camera' is stationary and the vertecies rotate (ie: the positive z axis is always pointed at you)

CRoNiXX · 21st Feb 2002, 03:48 PM

now, thats JUST what I wanted to say!

21st Feb 2002, 01:17 PM	#1
TWD Cute and Cuddly Join Date: Aug. 2nd, 2000 Location: Salt Lake City UT Posts: 7,268	3d to 2d I have created a 3d render program for my TI86. It can do all the rotations and stuff like that. It will make the cube rotate in space. Currently I take the x y z positions and I just ignore z and it graphs x and y. This of course doesn't give you a perspective. All I want to do is make a cube that I can rotate, I'm not even doing translations. The cube always stays in the center. __________________

21st Feb 2002, 03:19 PM	#2
Twisted Metal Anfractuous Aluminum Join Date: Jul. 28th, 2001 Location: Long Island, NY Posts: 7,015	uhh thanks for sharing Make a falldown clone game __________________

21st Feb 2002, 03:24 PM	#3
Elrod Random Join Date: Jun. 23rd, 2000 Location: an utterly insignificant little blue-green planet Posts: 337	Without being able to test it in front of me, I'm not certain this will work, but I believe if you multiply the x and y values for each vertex by a factor determined by (z+n)/n where n is some arbitrary factor for the amount of perspective distortion you want, you'll get what you're looking for. n should be large enough that your lowest z value will still result in a positive number, and the higher the value of n, the less distortion there will be - adjust to preference. This method only works if your 'camera' is stationary and the vertecies rotate (ie: the positive z axis is always pointed at you) __________________ Would it save you a lot of time if I just gave up and went mad now?

21st Feb 2002, 03:48 PM	#4
CRoNiXX Banned Join Date: Dec. 7th, 2001 Location: Hidden in the Closet Posts: 530	now, thats JUST what I wanted to say! __________________

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