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T2dShape3D rotateTo problem

by Brian Ratte · in Torque Game Builder · 02/23/2007 (5:23 am) · 2 replies

I am having some difficulty trying to use the rotateTo() function on a t2dShape3D object. It seems you cannot specify any rotation axes other than the X-axis. I need my objects to rotate in the Z axis. I am trying to avoid having to script an angle check in the onUpdateScene area, since I will be checking 35 objects and fear it may add too much overhead for a main loop function. Has anyone had any luck with using rotateTo() with a t2dShape3D object in any axis other than x?

The only other option I can think of is performing a setAngularVelocityZ() and scheduling an angle check to occur, and if it within a certain margin stopping the object. Basically writing my own setRotationTarget that works in all 3 axes.

Anyone have any suggestions?
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Torque Owner D. Robert Duke
#1
02/28/2007 (8:58 am)
Are you using the shape-specific methods?
setShapeRotation(x/y/z)
setShapeAngularVelocity(x/y/z)

Someone please correct me if there's a better way to do this, but I've been using a Timer to check my shape3D rotations. I don't need/want it to fire onUpdateScene. Here's some extremely simplified pseudocode:

onTimer {
%diff = %shape.getShapeRotation() - %shape.vecTargetRotation;
%shape.setShapeAngularVelocity(%diff);
}

Torque Owner Arthur Ogawa
#2
02/28/2007 (11:27 am)
I hate to spam this in, but I'm behind the eight-ball, so here's the best I can do:
The following code is my interface to a t2dShape3D instance called soldier. When you click on his body, he rotates faster and faster with each click. I am using setShapeAngularVelocity, which is a class method of t2dShape3D.

Good luck!
// soldier.cs

function soldier::onMouseDown( %this, %modifier, %worldPosition, %mouseClicks ) { 
	%this.incrementAngularVelocity( %worldPosition ) ; 
} 

function soldier::incrementAngularVelocity( %this, %worldPosition ) { 
	//	%this.dumpClassHierarchy( ) ; // t2dShape3D -> t2dSceneObject -> SimObject ->
	// The angular acceleration shall be proportional to the distance from the object's center (as if it were the C.O.G.)
	// The sign of the force is such that we appear to be pressing on the object.
	%pos     = %this.getPosition( ) ; 
	%deltaXY = t2dVectorSub( %pos, %worldPosition ) ; 
	%dx      = getWord( %deltaXY, 0 ) / %this.getSizeX( ) * -100 ; 
	%dy      = getWord( %deltaXY, 1 ) / %this.getSizeY( ) * -100 ; 
	%dOmega  = %dy SPC %dx SPC "0" ; 
	%omega   = %this.AngularVelocityAdd( %dOmega ) ; // Returns the new angular velocity
} 

function soldier::AngularVelocityAdd( %this, %sSAV ) { 
	// In order to increment the angular velocity of a t2dShape3D object, we have to deal with the strange API of this class.
	// The calls to getShapeAngularVelocity and setShapeAngularVelocity use different units and basis vectors! 
	// So we have to retrieve the object's angular velocity, convert to the proper units, and then do the increment. 
	// Finally we are ready to call the latter function. 
	%magic = 100 / 1.745329 ; // Units are different: 100 / ( Pi / 2 ) ?
	%gSAV  = %this.getShapeAngularVelocity( ) ; 
	%sSAVx = getWord( %sSAV, 0 ) + getWord( %gSAV, 0 ) * %magic ; 
	%sSAVy = getWord( %sSAV, 1 ) + getWord( %gSAV, 2 ) * %magic ; // Y and Z axes are transposed
	%sSAVz = getWord( %sSAV, 2 ) + getWord( %gSAV, 1 ) * %magic ; 
	%sSAV  = %sSAVx SPC %sSAVy SPC %sSAVz ; 
	%this.setShapeAngularVelocity( %sSAV ) ; 
	return
		%sSAV ; 
} 

function VectorAdd( %a, %b ) { 
	%result = "0 1 2" ; 
	%c = t2dGetMax( getWordCount( %a ), getWordCount( %b ) ) ; 
	for ( %i = 0; %i < %c ; %i++ ) { 
		%result = setWord( %result, %i, getWord( %a, %i ) + getWord( %b, %i ) ) ; 
	} 
	return 
		%result ; 
}