How do XY offsets work in codepointers?

Deathsong12 · Post by **Deathsong12** » Sat Aug 20, 2005 5:43 am

As far as I'm aware, X and Y offsets are different numbers, yet in code pointers like A_CustomMissile, both are rperesented by one number. Furthurmore, what units are these offsets in? If anyone could shed light on this topic, It would really be helpful.

Post by **TheDarkArchon** » Mon Aug 22, 2005 3:26 pm

An XY offset is an offset on the horizontal plane: This is because 3D co-ordinates are used and the players horizontal plane covers X and Y coordinates (Forward/Backwards and Left/Right).

Deathsong12 · Post by **Deathsong12** » Mon Aug 22, 2005 7:01 pm

Yah, I understand the theory behind it. I'm taking about effects like the Cyberdemon firing missiles from his arm, off center. Most likely, as far as my experements have demonstrated, the number that is XY offset is just X offset. If you want to use a Y offset, you can just alter the missile's spawnheight.

solarsnowfall · Post by **solarsnowfall** » Mon Aug 22, 2005 9:05 pm

Spawn height??? Set the missile height in the actor firing the missle to the appropreate value.

Post by **TheDarkArchon** » Tue Aug 23, 2005 9:40 am

Spawnheight is a Z offset. The horizontal plane (I.E left or right) is covered by 2 co-ordinates, X or Y. X is one direction, Y is another. The offset is "XY" when the direction used is met on neither axis (So it's offset by some X and Y units).

Deathsong12 · Post by **Deathsong12** » Tue Aug 23, 2005 10:28 am

Okay, I thought that the XY plane was the surface of the actor's bounding box, sorry. So I just use negative values th move it one way, positive the other?

Post by **TheDarkArchon** » Tue Aug 23, 2005 12:31 pm

positive == right, negative == left.

solarsnowfall · Post by **solarsnowfall** » Tue Aug 23, 2005 2:54 pm

I always just thought of it as the Z offset. And if a monster is using it, accomplish it with the MissileHeight of the monster if it is set as the monster MissileType. Only if it is the primary attack though.