camera help - GameCreators Forum

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Barbarian

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Joined: 11th Dec 2006

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Posted: 23rd Dec 2006 02:34 Edited at: 23rd Dec 2006 02:38

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I'm trying to make a 3rd person camera, in which the moving the x coordinate of the mouse moves the camera around the object. The problem i'm having so far is that the camera moves in a line instead of in a circle. I don't know how to explain this properly, so i'll try drawing it.

... and here's my code

+ Code Snippet

position camera object position X(1)+mousexv,object position y(1)+70,object position z(1)-150
point camera x#,y#+30,z#
mousexv=mousexv+mousemovex()

P.S x#,y# and z# are just variables which represent the object position.

Thanks

EDIT: I forgot to mention that the blue line is the camera, the green circle is the object and the y should be a z.

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TDK

Retired Moderator

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Joined: 19th Nov 2002

Location: UK

Posted: 23rd Dec 2006 03:10

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Theres code on my web site which does what you are after - if I understand you correctly. (Link in my sig).

Click on the Code Hints button and check out the various camera control examples.

TDK_Man

DB Tutorials, Hints & Tips, Utils and lots more...
TGPF - TDK's Game Programming Forums

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Barbarian

17

Years of Service

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Joined: 11th Dec 2006

Location:

Posted: 23rd Dec 2006 05:35 Edited at: 23rd Dec 2006 05:36

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Thanks TDK, i use your site as one of my main sources for learning DarkBASIC, but in this case i really want to build off my formula instead of changing it completely.

I made some progress, but there's still a problem, when the camera reaches the side of the object, the screen goes white. Here is my new code:

+ Code Snippet

MoveCamera:
   position camera object position X(1)+mousexv,object position y(1)+70,object position z(1)-sqrt(zposcam)
   point camera x#,y#+30,z#
   mousexv=mousexv+mousemovex()
   zposcam=350^2-mousexv^2
return

and also, since i'm <15, my maths knowledge isn't so great, so here's an explanation of how i got "zposcam=350^2-mousexv^2".

+ Code Snippet

x^2+y^2=r^2
x^2+z^2=r^2
x^2+z^2=350^2
mousemovex^2+zposcam^2=350^2
zposcam=350^2-mousemovex^2

x^2+y^2=r^2 is the formula for a circle on a grid in case i didn't write it clearly enough

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