Question For A Pythagorean Specialist

[Junrall]

Pointing to two spots in front of the player is straight forward. (If there is a simpler method... please let me know)


My question is... how do I point to two spots, in relation to the player, 35, 45, 90, or any chosen degree to the left or to the right? (in the images above and below spot1 is 50 units away from player and spot2 is 50 units from spot1)

[Spirit]

I have no idea how to code or whatever nor if you have coordinates, but if you do:

x = startingpointcoordinate + length * sinus (angle)
y = startingpointcoordinate + length * cosinus (angle)

would get your coordinates.

In your example with the player being 0,0 and the angle 45°.

x1 = 0 + 50 * sinus (45°)
y1 = 0 + 50 * cosinus (45°)

x2 = 0 + 100 * sinus (45°)
y2 = 0 + 100 * cosinus (45°)
or use the new coordinates you got for spot1.

[Sajt]

To get two points 45 degrees to the left and right, each 50 units away from the player, add a yaw offset to the player angles:

makevectors(self.v_angle + '0 45 0');
dot1 = self.origin + v_forward * 50;

makevectors(self.v_angle + '0 -45 0');
dot2 = self.origin + v_forward * 50;

You don't have to normalize v_forward, it's always unit-length (unless you changed it yourself).

In your first picture, note that:

(normalize(v_forward) * 50) + (normalize(v_forward));

is thus the same as:

v_forward * 50 + v_forward;

Which is of course the same as:

v_forward * 51;

[Teiman]

[Junrall]

[Sajt]

[Junrall]

[Junrall]

[Sajt]

If you look at the source to the mathlib_sin and mathlib_cos functions (http://www.inside3d.com/frikbot/qc/mathlib.qc), you'll see that they are calling makevectors. So by calling sin and cos you're calling makevectors twice, which is a waste...

Of course, speed-wise it doesn't really matter because this would only actually affect your framerate if you were doing it thousands of times per frame. But it is "good practice" and "cleaner" to do it this way (calling makevectors instead of sin/cos), which is a big deal to obsessive programmers like us...