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Pivoting an object around a point

by Matthew Shapiro · in Torque X 2D · 03/24/2008 (5:07 pm) · 2 replies

Is there an easy way to pivot an object around a point without using T2dSceneObjects + linkpoints?

*edit*

aha got it
// Calculate angle from offset
                                angle = (float)Math.Atan(offset.Y / offset.X);

                                // Correct for negative values
                                if (offset.X < 0)
                                    angle += MathHelper.Pi;

                                distance = offset.Length();
                                offset.X = (float)Math.Cos(angle + MathHelper.ToRadians(Camera.Rotation)) * distance;
                                offset.Y = (float)Math.Sin(angle + MathHelper.ToRadians(Camera.Rotation)) * distance;
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Associate John Kanalakis
EnvyGames
#1
03/25/2008 (7:07 pm)
Awesome Matt! I figured that it would come down to some trig math since there isn't anything baked into the engine. Also, thank you for posting. I'm working on a 3D orbital camera and this is going to come in handy.

John K.

Torque Owner Matthew Shapiro
#2
03/25/2008 (8:00 pm)
Sorry, code I originally posted was old and wrong (didn't realize Math.Atan returns radians in first revision). Latest code works 100%.

Also, if anyone cares I am working on a Camera Manager class right now. The purpose of this class is to allow advanced functions (such as following an object at an offset), queuing up camera commands (so you can do things like have the camera move along waypoints, so once it gets to the first waypoint it goes to the next, etc..), give time delayed effects (so fade the camera as you move towards a target), and manage all of these commands for multiple cameras.

I should have it released in a few days. Right now I'm writing it for 2d cameras, but (as far as I can tell) I've written it so it should be easy to add new functions as well as support 3d cameras.