Working out a position with just X,Y,Z - Printable Version

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+--- Thread: Working out a position with just X,Y,Z (/showthread.php?tid=306664)

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Working out a position with just X,Y,Z - Kyle - 27.12.2011

Hi, I need a function for it to work out the position of the checkpoint exit position look in the image below:



The brown line = Wall
Blue dot = CP
Red X = Where I want the exit pos to be.

If I have the x,y,z of the CP can I find out the x,y,z of the red X?

Kyle

Thanks!

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Re: Working out a position with just X,Y,Z - Babul - 27.12.2011

does your checkpoint data include an angle for the checkpoint? providing one, you can calculate the exit point with the sinus/cosinus functions. with the walls orientation, the angle of the checkpoint could be calculated aswell.
presuming your checkpoint coordinates are cX,cY,cZ,cA, and Radius is like 5 units, this should give you some results:
you noticed the 180 - in your example the wall is at north, thats 0 degrees. rotate (sour skin) 180 degrees, then you watch away from that wall. step forward 5 units, then you got back to your desired position. the same trick will work on any wall rotation, just think about a 90 degrees rotated wall: the sinus will be 0, where the cosinus is 1. the cosinus axis result adds the radius (5) multiplied with the bias (cosinus value=1) == 5 to the left (90 plus 180= 270, thats the left side)

i typed this out of my mind, w/o checking...

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