Game Development Community

Testing If An Object Exists At Coordinates (x,y), How?

by Leo Gura · in Torque Game Builder · 09/30/2006 (7:59 pm) · 5 replies

I need a way to test whether an object of a certain class exists at a certain set of coordinates. Is there a function for this?

Also, is there a way to change the origin point of the object. For instance, I'd like to be able to rotate an object, but not around the center point, how would this be done. Also, I'd like to be able to offset the sprite a certain amount of pixels from the object's center.

Thanks.
NextNext Thread
PrevPrevious Thread
More from Torque Game Builder


Torque Owner Corey Martin
#1
09/30/2006 (8:27 pm)
You can use pickPoint, which returns a list of objects at a specific world coordinate. Check the TGB reference guide under t2dSceneGraph methods. After using pickPoint on your coordinate, loop through all the objects returned and check the class of each object returned. You can pass a specific layer to check to the pickPoint function using the layer mask to keep the number of objects that you're scanning through low, which will reduce the performance hit.

Torque Owner Leo Gura
#2
09/30/2006 (11:48 pm)
Excellent! This is just what I was looking for. Thank you.

Torque Owner Ben R Vesco
#3
10/01/2006 (1:17 am)
To answer your second question:

There is no way to alter the origin point of an object. If you absolutely need to rotate it around a point other than center you have two choices. The first involves creating your image "off center" in the source file by adding extra alpha transparency off to one side. The second involves doing some trigonometry in script to reposition the object by a certain offset each time it is rotated.

Torque Owner Corey Martin
#4
10/01/2006 (7:12 am)
If im not mistaken, another option to your second question would be to mount the object which needs to be offset to another, invisible sceneObject. Since you can place mount points anywhere you like, just place the mount point on the invisible sceneObject such that rotating it from the center will rotate your target sprite as needed. I believe this is the workaround that many people used back in the T2D days.

Torque Owner Ben R Vesco
#5
10/01/2006 (9:54 am)
@Corey

Brilliant, I love it!