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DarkBASIC Discussion / The Sphere math

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TheComet
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Location: I`m under ur bridge eating ur goatz.
Posted: 1st Mar 2008 17:53 Edited at: 2nd Mar 2008 01:07
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Hey guys!

Latch solved the last circle math, but now I need a sphere math.

Like in the circle, you use r=sqrt(((x#-midx#)^2)+((z#-midz#)^2), which will return the radius from the center of the circle (midx#,midz#) to the position of the player (x#,z#). If you don`t get it this far, view this thread : Circle Math Problem

What I need now, is a formula which will return the radius from the center to any point in space.

Many thanks, TheComet

Oooooops!!! I accidentally formated drive c.
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TDK
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Posted: 1st Mar 2008 18:13
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You are talking about a 3D sphere right? Because it's X,Y,Z position is the centre and you just use the standard 3D distance formula to do what you want.

TDK_Man

* TDK's Game Programming Forums - Open To All - DB & Team Request Boards *

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Yodaman Jer
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Posted: 1st Mar 2008 18:28
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Ouch, I couldn't do those calculations even if my life depended on it...is this bad if I want to become a programmer? lol...


Thanks BigAdd!!
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Tone3e
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Posted: 1st Mar 2008 23:14
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Well in some cases it is necessary, but I do not see why you could not learn it. That is just using the basic distance formula which is Square Root(a^2+b^2)

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Come see the WIP!center]
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TheComet
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Posted: 2nd Mar 2008 01:07
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Quote: "You are talking about a 3D sphere right? Because it's X,Y,Z position is the centre and you just use the standard 3D distance formula to do what you want.

TDK_Man"


I am talking about a 3d Sphere, but by doing the x,y,z position way, I don`t get the radius from the middle. And that is what I need.

TheComet

Oooooops!!! I accidentally formated drive c.
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Latch
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Posted: 2nd Mar 2008 03:13 Edited at: 2nd Mar 2008 03:16
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TDK is right,

instead of just sqrt((x2-x1)^2+(z2-z1)^2), you'd have to add the y in there too: sqrt((x2-x1)^2+(y2-y1)^2+(z2-z1)^2)

Where x1,y1,z1 is the starting point and x2,y2,z2 is the ending point. Representing points in 3d space.

If you are talking about a sphere object that you want to find the radius of, just use
radius#=OBJECT SIZE(num)/2.0

Enjoy your day.
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TheComet
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Posted: 27th Mar 2008 00:39
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Thanks guys! The "r=sqrt((x2-x1)^2+(y2-y1)^2+(z2-z1)^2)" worked fine!

Oooooops!!! I accidentally formated drive c.
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Libervurto
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Posted: 6th Apr 2008 21:10
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I think he wanted to find the distance from the centre of the sphere to another object, that's why he didn't just use sphere position.
Is that right Comet?

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