SpatialED.TarquinPanoramaBuilder

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//=============================================================================
// Spatial Fear
// Class: TarquinPanoramaBuilder
// Description: builds a set of sheets in an open tube: to make landscapes in 
//				the skybox.
//
// Author: Tarquin
// + Used with permission for packaging with SpatialED v2.1
//=============================================================================
class TarquinPanoramaBuilder
	expands BrushBuilder;

var() float Height, PanelWidth, Radius;
var() int Sides, PanelsPerSide;
var() bool AlignToSide;
var() name GroupName;

function bool Build()
{
	local int i, j, k;
	local vector BaseVector, SideVector, HeightVector;
	local rotator SpinTransformation;

	// ^^^^^^^^^^^^^^^^^^^^ check user input
	if( Sides < 3 || PanelsPerSide < 1 )
		return BadParameters("Must have at least three sides and one panel per side.");
	if( Height <= 0 )
		return BadParameters("Height must be positive."); 
	if( PanelWidth < 0 || Radius < 0 )
		return BadParameters("PanelWidth or Radius may not be negative."); 
	// we ensure we have ONE positive, ONE zero.
	if( ! ( PanelWidth == 0 ^^ Radius == 0 ) )
		return BadParameters("Set either the PanelWidth, or the Radius. Whichever you want the builder to ignore, set to zero. You cannot set both!");
	// ^^^^^^^^^^^^^^^^^^^^ define some new variables. leave user entered data intact
	if( Radius > 0 )
		BaseVector.x = Radius ;
	else
		BaseVector.x = ( PanelWidth * PanelsPerSide / 2 ) / sin( pi / Sides ) ;
	HeightVector.z = Height ;
	SpinTransformation.Yaw = 65536.0f / Sides ;

	// user entered radius/width, height, sides converted to vector / rotator; modify them if aligned to side	
	if ( AlignToSide )
	{
		if( Radius > 0 )
			BaseVector.x /= cos( pi / Sides ) ; 
		// perceptual shift: a/!a leads to essentially diff r, but same w will be expected
		BaseVector = BaseVector >> ( SpinTransformation / 2 ) ; 
		// set the new effective radius to a corner. Then spin the vector so it points to first corner.
	}
	
	SideVector = ( ( BaseVector >> SpinTransformation ) - BaseVector ) / PanelsPerSide ; 

	BeginBrush( false, GroupName );

	// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ build vertices
	for( k = 0 ; k < 2 ; k++ )
		for( j = 0 ; j < Sides ; j ++ )
			for( i = 0 ; i < PanelsPerSide ; i ++ )
				Vertexv( 
					k * HeightVector
					+ ( ( BaseVector + i*SideVector ) >> ( SpinTransformation * j ) )
					);
	// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ build polys
	for( i = 0 ; i < Sides * PanelsPerSide ; i++ )
	{
		Poly4i( 1, 
			i, 
			i + ( Sides * PanelsPerSide ),
			(( i+1 )%(Sides * PanelsPerSide)) + Sides * PanelsPerSide ,
			( i+1 )%(Sides * PanelsPerSide) , 
			'panorama',
			0x00000108 );// flags for sheet, two-sided.
			// the order of vertices is important: produces inner-facing polys, right way up.
	}
	return EndBrush();
}

defaultproperties
{
     Height=128.000000
     PanelWidth=128.000000
     Sides=4
     PanelsPerSide=2
     AlignToSide=True
     GroupName=Skybox
     BitmapFilename="SFEDBBTarquinPanorama"
     ToolTip="Skybox Builder"
}

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