Using special-purpose groups
ColumnScene.java
//
// CLASS
// ColumnScene - shapes and lights for a scene with gothic columns
//
// DESCRIPTION
// This class builds a scene containing a stone floor, a set of
// marble columns, plus appropriate lighting. The scene is used in
// several of the examples to provide content to affect with lights,
// background colors and images, and so forth.
//
// SEE ALSO
// ExExponentialFog
// ExLinearFog
//
// AUTHOR
// David R. Nadeau / San Diego Supercomputer Center
//
import java.awt.*;
import java.awt.event.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.image.*;
public class ColumnScene
extends Group
{
//--------------------------------------------------------------
// SCENE CONTENT
//--------------------------------------------------------------
// Construction parameters
private final static float ColumnHeight = 3.0f;
private final static float ColumnRadius = 0.2f;
private final static float ColumnDepthSpacing = 6.0f;
private final static float ColumnSideOffset = 1.0f;
private final static int NumberOfColumns = 4;
private final static float WalkwayWidth = 3.0f;
private final static float WalkwayDepth = ((float)NumberOfColumns-1) * ColumnDepthSpacing + 4.0f * WalkwayWidth;
private final static float LawnWidth = 4.0f * WalkwayWidth;
private final static float LawnDepth = WalkwayDepth;
private Texture columnTex = null;
//
// Build a single column in a shared group
//
private SharedGroup buildSharedColumn( )
{
Appearance columnApp = new Appearance( );
Material columnMat = new Material( );
columnMat.setAmbientColor( 0.6f, 0.6f, 0.6f );
columnMat.setDiffuseColor( 1.0f, 1.0f, 1.0f );
columnMat.setSpecularColor( 0.0f, 0.0f, 0.0f );
columnApp.setMaterial( columnMat );
TextureAttributes columnTexAtt = new TextureAttributes( );
columnTexAtt.setTextureMode( TextureAttributes.MODULATE );
columnTexAtt.setPerspectiveCorrectionMode( TextureAttributes.NICEST);
columnApp.setTextureAttributes( columnTexAtt );
if ( columnTex != null )
columnApp.setTexture( columnTex );
GothicColumn columnShape = new GothicColumn(
ColumnHeight, // height
ColumnRadius, // radius
GothicColumn.BUILD_TOP, // flags
columnApp ); // appearance
// BEGIN EXAMPLE TOPIC
// Build a shared group to hold the column shape
SharedGroup column = new SharedGroup( );
column.addChild( columnShape );
// END EXAMPLE TOPIC
return column;
}
//
// Used a column in a shared group and link to it
// several times to build a double row of columns
//
private Group buildColumns( SharedGroup column )
{
Group group = new Group( );
// Place columns
float x = -ColumnSideOffset;
float y = -1.6f;
float z = ColumnDepthSpacing;
float xSpacing = 2.0f * ColumnSideOffset;
float zSpacing = -ColumnDepthSpacing;
// BEGIN EXAMPLE TOPIC
Vector3f trans = new Vector3f( );
Transform3D tr = new Transform3D( );
TransformGroup tg;
for ( int i = 0; i < NumberOfColumns; i++ )
{
// Left link
trans.set( x, y, z );
tr.set( trans );
tg = new TransformGroup( tr );
tg.addChild( new Link( column ) );
group.addChild( tg );
// Right link
trans.set( x+xSpacing, y, z );
tr.set( trans );
tg = new TransformGroup( tr );
tg.addChild( new Link( column ) );
group.addChild( tg );
z += zSpacing;
}
// END EXAMPLE TOPIC
return group;
}
//
// Build a scene containing multiple columns
//
public ColumnScene( Component observer )
{
BoundingSphere worldBounds = new BoundingSphere(
new Point3d( 0.0, 0.0, 0.0 ), // Center
1000.0 ); // Extent
// Add a few lights
AmbientLight ambient = new AmbientLight( );
ambient.setEnable( true );
ambient.setColor( new Color3f( 0.2f, 0.2f, 0.2f ) );
ambient.setInfluencingBounds( worldBounds );
addChild( ambient );
DirectionalLight dir1 = new DirectionalLight( );
dir1.setEnable( true );
dir1.setColor( new Color3f( 1.0f, 1.0f, 1.0f ) );
dir1.setDirection( new Vector3f( 0.8f, -0.35f, 0.5f ) );
dir1.setInfluencingBounds( worldBounds );
addChild( dir1 );
DirectionalLight dir2 = new DirectionalLight( );
dir2.setEnable( true );
dir2.setColor( new Color3f( 0.75f, 0.75f, 1.0f ) );
dir2.setDirection( new Vector3f( -0.7f, -0.35f, -0.5f ) );
dir2.setInfluencingBounds( worldBounds );
addChild( dir2 );
// Load textures
TextureLoader texLoader = new TextureLoader( "grass06.jpg", observer );
Texture grassTex = texLoader.getTexture( );
if ( grassTex == null )
System.err.println( "Cannot load grass06.jpg texture" );
else
{
grassTex.setBoundaryModeS( Texture.WRAP );
grassTex.setBoundaryModeT( Texture.WRAP );
grassTex.setMinFilter( Texture.NICEST );
grassTex.setMagFilter( Texture.NICEST );
grassTex.setMipMapMode( Texture.BASE_LEVEL );
grassTex.setEnable( true );
}
texLoader = new TextureLoader( "marble10.jpg", observer );
Texture walkTex = texLoader.getTexture( );
if ( walkTex == null )
System.err.println( "Cannot load marble10.jpg texture" );
else
{
walkTex.setBoundaryModeS( Texture.WRAP );
walkTex.setBoundaryModeT( Texture.WRAP );
walkTex.setMinFilter( Texture.NICEST );
walkTex.setMagFilter( Texture.NICEST );
walkTex.setMipMapMode( Texture.BASE_LEVEL );
walkTex.setEnable( true );
}
texLoader = new TextureLoader( "granite07rev.jpg", observer );
columnTex = texLoader.getTexture( );
if ( columnTex == null )
System.err.println( "Cannot load granite07rev.jpg texture" );
else
{
columnTex.setBoundaryModeS( Texture.WRAP );
columnTex.setBoundaryModeT( Texture.WRAP );
columnTex.setMinFilter( Texture.NICEST );
columnTex.setMagFilter( Texture.NICEST );
columnTex.setMipMapMode( Texture.BASE_LEVEL );
columnTex.setEnable( true );
}
//
// Build the ground
// +-----+---+-----+
// | | | |
// | G | W | G |
// | | | |
// +-----+---+-----+
//
// where "G" is grass, and "W" is a walkway between columns
//
Vector3f trans = new Vector3f( );
Transform3D tr = new Transform3D( );
TransformGroup tg;
// Walkway appearance
Appearance walkApp = new Appearance( );
Material walkMat = new Material( );
walkMat.setAmbientColor( 0.5f, 0.5f, 0.5f );
walkMat.setDiffuseColor( 1.0f, 1.0f, 1.0f );
walkMat.setSpecularColor( 0.0f, 0.0f, 0.0f );
walkApp.setMaterial( walkMat );
TextureAttributes walkTexAtt = new TextureAttributes( );
walkTexAtt.setTextureMode( TextureAttributes.MODULATE );
walkTexAtt.setPerspectiveCorrectionMode( TextureAttributes.NICEST );
tr.setIdentity( );
tr.setScale( new Vector3d( 1.0, 6.0, 1.0 ) );
walkTexAtt.setTextureTransform( tr );
walkApp.setTextureAttributes( walkTexAtt );
if ( walkTex != null )
walkApp.setTexture( walkTex );
// Grass appearance
Appearance grassApp = new Appearance( );
Material grassMat = new Material( );
grassMat.setAmbientColor( 0.5f, 0.5f, 0.5f );
grassMat.setDiffuseColor( 1.0f, 1.0f, 1.0f );
grassMat.setSpecularColor( 0.0f, 0.0f, 0.0f );
grassApp.setMaterial( grassMat );
TextureAttributes grassTexAtt = new TextureAttributes( );
grassTexAtt.setTextureMode( TextureAttributes.MODULATE );
grassTexAtt.setPerspectiveCorrectionMode( TextureAttributes.NICEST );
tr.setIdentity( );
tr.setScale( new Vector3d( 2.0, 8.0, 1.0 ) );
grassTexAtt.setTextureTransform( tr );
grassApp.setTextureAttributes( grassTexAtt );
if ( grassTex != null )
grassApp.setTexture( grassTex );
// Left grass
trans.set( -LawnWidth/2.0f - WalkwayWidth/2.0f, -1.6f, 0.0f );
tr.set( trans );
tg = new TransformGroup( tr );
ElevationGrid grass1 = new ElevationGrid(
2, // X dimension
2, // Z dimension
LawnWidth, // X spacing
LawnDepth, // Z spacing
grassApp ); // appearance
tg.addChild( grass1 );
addChild( tg );
// Right grass
trans.set( LawnWidth/2.0f + WalkwayWidth/2.0f, -1.6f, 0.0f );
tr.set( trans );
tg = new TransformGroup( tr );
ElevationGrid grass2 = new ElevationGrid(
2, // X dimension
2, // Z dimension
LawnWidth, // X spacing
LawnDepth, // Z spacing
grassApp ); // appearance
tg.addChild( grass2 );
addChild( tg );
// Walkway
trans.set( 0.0f, -1.6f, 0.0f );
tr.set( trans );
tg = new TransformGroup( tr );
ElevationGrid walk = new ElevationGrid(
2, // X dimension
2, // Z dimension
WalkwayWidth, // X spacing
WalkwayDepth, // Z spacing
walkApp ); // appearance
tg.addChild( walk );
addChild( tg );
//
// Build several columns on the floor
//
SharedGroup column = buildSharedColumn( );
Group columns = buildColumns( column );
addChild( columns );
}
}