SpatialED.TarquinTorusBuilder

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//=============================================================================
// Spatial Fear
// Class: TarquinPanoramaBuilder
// Description: Builds a 3D torus brush.  Compatible with cylinder of same 
//				size in both axes.
//
// Author: Tarquin
// + Used with permission for packaging with SpatialED v2.1
//=============================================================================
class TarquinTorusBuilder
	expands BrushBuilder;
var() float OuterRadius, TubeThickness;
var() int WheelSides, WheelSidesUsed, TubeSides;
enum EAlignStyle
{
	AL_Plain,
	AL_Side,
	AL_Caps,
};
var() EAlignStyle WheelAlignType;
var() bool TubeAlignToSide;
var() name GroupName;

/*
var() enum ItemNamingType
{
	BySpoke,
	BySlice,
} ItemNaming;
*/

function bool Build()
{
	local int i, j, TubeOfs, WheelOfs, XWheelSidesUsed, WheelPartial;
	local float CentrumRadius, TubeRadius, TubeSquishRadius, CACentrumRadius;

	if( TubeSides<3 || WheelSides<3 )
		return BadParameters("The tube and wheel must have at least three sides");
	if( OuterRadius<=0 || TubeThickness <= 0 )
		return BadParameters("Radius and thickness must be positive");
	if( TubeThickness >= OuterRadius )
		return BadParameters("Thickness must be smaller than Outer Radius");

/* internal nomenclature:
w, t: wheel and tube sides
p: partial sides required
m: centrum radius
b: tube radius
q: tube squish radius
*/

// define some new variables
// leave user entered data intact
	if( WheelSidesUsed <= 0 || WheelSidesUsed >= WheelSides )
		XWheelSidesUsed = WheelSides ;
	else
		XWheelSidesUsed = WheelSidesUsed ;

	WheelPartial 		= XWheelSidesUsed ;

	TubeRadius 		= TubeThickness / 2 ;
	TubeSquishRadius 	= TubeRadius ;
	CentrumRadius 		= OuterRadius - TubeRadius ;
	CACentrumRadius 	= CentrumRadius ;

/*
 The TubeSquishRadius
This is EXTREMELY important -- big trip up here
The wheel offset is basically a transformation of the x-y plane
Whether Tube is ofset or not, we are now asking the hoops
to be non-regular -- with w=4 , they lie on the diagonals of the square,
and with t=4 too for clarity it can easily be seen that the hoop is no longer a square
The z component must NOT be affected by wheel trans, hence the (annoying!) extra variable
This one was a headache and a half!
*/

if (TubeAlignToSide)
{
	TubeOfs = 1 ;
	TubeRadius /= cos( pi / TubeSides ) ;
	TubeSquishRadius /= cos( pi / TubeSides ) ;
}
if ( WheelAlignType !=  AL_PLain )   
{
	// old  WheelAlignToSide = true
	WheelOfs = 1 ;
	TubeSquishRadius /= cos( pi / WheelSides ) ;
	CentrumRadius /= cos( pi / WheelSides ) ;
}
if ( XWheelSidesUsed == WheelSides )
{
	WheelPartial-- ;
/* 
this is a doctored value of sides used to make it work! (arggg!)
basically, whether we want full wheel or full-1 wheel, we have the same
number of vertices, we just skip the final bridge.
for 1,2,3...,w-1 sections, we want 2,3,4...,w hoops
for the full w sections we also want w hoops
the +1 is included in the count for the vertex builder, this knocks it
down in anticipation so we don't go to w+1
this is only needed for the vertices, not the bridges.
*/
}

// make the brush!

	BeginBrush( false, GroupName );

if( ( WheelAlignType == AL_Caps ) && ( XWheelSidesUsed != WheelSides ) )
{
j = 0 ;
log("wheel offset");
log(WheelOfs);
// log("j:");
// log(j);
// this takes the old value of CentrumRadius -- recalculate from user input
for( i = 0 ; i < TubeSides ; i++ )
			Vertex3f(  
	CACentrumRadius * cos( 2*j*pi / WheelSides ) 
		+ TubeRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* cos( 2*j*pi / WheelSides ) , 
	CACentrumRadius * sin( 2*j*pi / WheelSides ) + 
		TubeRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* sin( 2*j*pi / WheelSides ) , 
	TubeRadius * sin( (2*i + TubeOfs)*pi/TubeSides ) 
			 );
// If we are in this loop, WheelPartial has NOT been doctored
// a loop from 1 to WheelPartial
for( j = 1 ;  j < WheelPartial + 1; j++ )
	{
		for( i = 0 ; i < TubeSides ; i++ )
			Vertex3f(  
	CentrumRadius * cos( (2*j - WheelOfs)*pi / WheelSides ) 
		+ TubeSquishRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* cos( (2*j - WheelOfs)*pi / WheelSides ) , 
	CentrumRadius * sin( (2*j - WheelOfs)*pi / WheelSides ) + 
		TubeSquishRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* sin( (2*j - WheelOfs)*pi / WheelSides ) , 
	TubeRadius * sin( (2*i + TubeOfs)*pi/TubeSides ) 
			 );
	}
j = WheelPartial ;
for( i = 0 ; i < TubeSides ; i++ )
			Vertex3f(  
	CACentrumRadius * cos( 2*j*pi / WheelSides ) 
		+ TubeRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* cos( 2*j*pi / WheelSides ) , 
	CACentrumRadius * sin( 2*j*pi / WheelSides ) + 
		TubeRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* sin( 2*j*pi / WheelSides ) , 
	TubeRadius * sin( (2*i + TubeOfs)*pi/TubeSides ) 
			 );
// now doctor wheelpartial for the polys
WheelPartial++ ;
}
else
{
	// remember, TubeSquishRadius only differs from TubeRadius if WheelAlign
	for( j = 0 ; j < WheelPartial + 1 ; j++ )
		for( i = 0 ; i < TubeSides ; i++ )
			Vertex3f(  
	CentrumRadius * cos( (2*j - WheelOfs)*pi / WheelSides ) 
		+ TubeSquishRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* cos( (2*j - WheelOfs)*pi / WheelSides ) , 
	CentrumRadius * sin( (2*j - WheelOfs)*pi / WheelSides ) + 
		TubeSquishRadius 
			* cos( (2*i + TubeOfs)*pi/TubeSides ) 
			* sin( (2*j - WheelOfs)*pi / WheelSides ) , 
	TubeRadius * sin( (2*i + TubeOfs)*pi/TubeSides ) 
			 );
	WheelPartial = XWheelSidesUsed ;
	// un-doctor this value
}
// build polys
// the modulo enables wrapping at both ends.
// interestingly, fiddle with it and you might be able to get a Klein bottle! Would look terrible though!


if( XWheelSidesUsed == WheelSides - 1 )
{
	for( j = 0 ; j < WheelPartial ; j++ )
		for( i = 0 ; i < TubeSides ; i++ )
			Poly4i( -1 ,
				j*TubeSides + i , 
				j*TubeSides + (i+1)%TubeSides , 
				( (j+1) )*TubeSides + ((i+1)%TubeSides) , 
				( (j+1) )*TubeSides + i , 
				'wall' );
}
else
{
	log("wheelPartial:");
	log( WheelPartial );
	for( j = 0 ; j < WheelPartial ; j++ )
		for( i = 0 ; i < TubeSides ; i++ )
			Poly4i( -1 ,
				j*TubeSides + i , 
				j*TubeSides + (i+1)%TubeSides , 
				( (j+1)%WheelSides )*TubeSides + ((i+1)%TubeSides) , 
				( (j+1)%WheelSides )*TubeSides + i , 
				'wall' );
}

if( XWheelSidesUsed < WheelSides )
{
	PolyBegin( 1, 'cap' );
		for( i=0; i<TubeSides; i++ )
			Polyi( i );
		PolyEnd();
	PolyBegin( -1, 'cap' );
		for( i=0; i<TubeSides; i++ )
			Polyi( TubeSides*WheelPartial + i );
		PolyEnd();
	// uses doctored wheelpartial to catch the cap align case.
}
	return EndBrush();
}

defaultproperties
{
     OuterRadius=256.000000
     TubeThickness=64.000000
     WheelSides=8
     WheelSidesUsed=8
     TubeSides=8
     TubeAlignToSide=True
     GroupName=Torus
     BitmapFilename="SFEDBBTarquinTorus"
     ToolTip="Torus Builder"
}

class file time: 12/7/2003 3:58:26 PM - creation time: 12/7/2003 4:03:46 PM
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