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Newcomers DBPro Corner / distance - camera to object

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deaths judge
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Posted: 7th Jul 2009 23:32 Edited at: 7th Jul 2009 23:33
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Okay for start ive been away from programing for about a year

How would i measure the distance from the camera to the object as im making a flight game (space) and have the movement figured but i would like it to check if the camera is a curtain distance away from the cube if so it goes towards it.

here is my movement code atm:




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bobbel
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Location: In my DBPro case xD
Posted: 7th Jul 2009 23:35
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i have a function here:



it ruturns the distance in a 3d world. here's how u use it in your case:



Your signature was erased by a mod because you copied mine!
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Dream And Death
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Posted: 7th Jul 2009 23:38 Edited at: 7th Jul 2009 23:38
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Lol, ninja'ed

"You get what everyone gets, you get a lifetime!" - Death, The Sandman Library

First you Dream, then you ... - Neil Gaiman, 2001
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deaths judge
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Posted: 8th Jul 2009 00:00
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cheers guys im loving the fast rersponse

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bobbel
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Posted: 8th Jul 2009 08:12
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But thats not a function!

Your signature was erased by a mod because you copied mine!
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Dream And Death
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Posted: 8th Jul 2009 21:07
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Err, I never said it was Bobbel - just that you had posted while I was typing...i.e. ninja'ed!

"You get what everyone gets, you get a lifetime!" - Death, The Sandman Library

First you Dream, then you ... - Neil Gaiman, 2001
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Sasuke
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Posted: 9th Jul 2009 23:15
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Vector math is so much faster so:



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KISTech
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Posted: 10th Jul 2009 01:45
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I can't locate the thread right now, but a while back there were several people in a debate over which method of finding distance is fastest.

It was determined that,



was actually faster.

x# * x# is significantly faster than x#^2

Interestingly enough, no one had suggested using ^0.5 instead of sqrt(), so I put that into the code I used to prove out the results. It turns out, using dist# = dist#^0.5 gives the same answer as sqrt(dist#) and is faster.

So the fastest distance calculation with DBPro would be,



On my machine this runs in 11ms, where the vector length calculation runs in 12ms. Not much difference I know, but when you're talking about calculating possibly hundreds of distances per loop, it adds up.

Enjoy.

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Dream And Death
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Posted: 10th Jul 2009 02:08
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Quote: "Interestingly enough, no one had suggested using ^0.5 instead of sqrt()"
.....err, except me!

"You get what everyone gets, you get a lifetime!" - Death, The Sandman Library

First you Dream, then you ... - Neil Gaiman, 2001
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KISTech
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Posted: 10th Jul 2009 18:14
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I meant in the other thread. Thanks for bringing that up, because it knocks about 10-15ms off of using sqrt().

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Sasuke
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Posted: 13th Jul 2009 15:28 Edited at: 13th Jul 2009 15:28
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Don't know if this is the same thread I was in, but i'm pretty sure using vectors were the fastest when it came to larger calculation (though don't hold me to that, I can't quite remember), although I wasn't awhere of (x#*x# + y#*y# + z#*z#)^0.5 being faster than sqrt(), I think I'll have a look at that also i'll look for that thread.

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