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DarkBASIC Professional Discussion / How to curve a matrix?

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AzureZeal
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Posted: 11th Jul 2003 11:39
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Im trying to get my matrix to do a real dome/sphere curve, but keep running into problems. Even when I use a true curved height value (using newyvalue()) the curve ends up looking almost like a straight slant. Anyone have any code of a real matrix curve, or any advice that might help?

Thanks in advance
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The Darthster
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Posted: 11th Jul 2003 12:45
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You can use a sine wave to make a curved matrix:



This is actually a sin^2 graph, but you can see what it's doing.

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David T
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Posted: 11th Jul 2003 13:04
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You could create a matrix with a block of height (a few tiles higher than the rest), then smooth it off to make it look curvy.

To smooth a matrix, go through each tile and take the average of the hieghts of all its surrounding tiles. Then set the current tile to that average.

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AzureZeal
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Posted: 12th Jul 2003 02:15
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Thanks a ton darth that looks like its just what I need. But im having a little trouble getting a custom sized curve to work. I get the start and finishing coords into a/b, and Im dividing the number of xsteps and zsteps by 180, but for some reason the curve seems be dipping back down at the end (looks more like a wave than a curved hill). Any idea what I might be doing wrong at the end? Heres the code...

a# = (180.0/xsteps)
b# = (180.0/zsteps)

for a = firstx to lastx
for b = firstz to lastz
set matrix height 1,a,b,sin(a*a#)*sin(b*b#)*height#
next b
next a

You mentioned something about a sin^2 graph? Does that have something to do with the wave im getting?

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AzureZeal
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Posted: 12th Jul 2003 06:29
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Figured out what I was doing wrong. Because the sin is assuming a and b will start at 0, when I tryed to make a curve anywhere besides 0,0, the curve would be all messed up. Here is how I solved it if youd like to know...

a# = (180.0/xsteps)
b# = (180.0/zsteps)

tester = 0: tester2 = 0
for a = firstx to lastx
for b = firstz to lastz
set matrix height 1,a,b,sin(tester*a#)*sin(tester2*b#)*height#
inc tester2
next b
tester2 = 0: inc tester
next a

Thanks again darth, looks great

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The Darthster
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Posted: 12th Jul 2003 12:05
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No problem.

Once I was but the learner,
now, I am the Master.
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