org.j3d.renderer.aviatrix3d.loader.vterrain

Class BTLoader

java.lang.Object

org.j3d.renderer.aviatrix3d.loader.vterrain.BTLoader

All Implemented Interfaces:

org.j3d.loaders.HeightMapSource, AVLoader

public class BTLoader
extends Object
implements AVLoader, org.j3d.loaders.HeightMapSource

Loader for the VTerrain Project's BT file format.

The mesh produced is, by default, triangle strip arrays. The X axis represents East-West and the Z-axis represents North-South. +X is east, -Z is North. Texture coordinates are generated for the extents based on a single 0-1 scale for the width of the object.

The loader produces a single mesh that represents the file's contents. No further processing is performed in the current implementation to break the points into smaller tiles or use multi-resolution terrain structures.

The definition of the file format can be found at: http://www.vterrain.org/Implementation/BT.html The BT format does not contain any form of scene graph other than the raw terrain geometry, so all load flags are ignored.

Version:

$Revision: 1.3 $

Author:

Justin Couch

Field Summary

Fields inherited from interface org.j3d.renderer.aviatrix3d.loader.AVLoader

BACKGROUNDS, FOGS, GEOMETRY, LAYERS, LIGHTS, LOAD_ALL, RUNTIMES, VIEWPOINTS

Constructor Summary

Constructors

Constructor and Description
BTLoader() Construct a new default loader with no flags set

Method Summary

Modifier and Type	Method and Description
float[]	getGridStep() Fetch information about the real-world stepping sizes that this grid uses.
org.j3d.loaders.vterrain.BTHeader	getHeader() Get the header used to describe the last stream parsed.
float[][]	getHeights() Return the height map created for the last stream parsed.
int	getLoadFlags() Get the current set collection of load flags.
org.j3d.loaders.HeightMapSourceOrigin	getOriginLocation()
boolean	isInternalModelKept() Check to see whether the loader should be currently keeping the internal model.
void	keepInternalModel(boolean enable) Define whether this loader should also keep around it's internal representation of the file format, if it has one.
AVModel	load(File file) Load a model from the given file.
AVModel	load(InputStream stream) Load a model from the given input stream.
AVModel	load(URL url) Load a model from the given URL.
void	setLoadFlags(int flags) Set the flags for which parts of the file that should be loaded.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BTLoader

public BTLoader()

Construct a new default loader with no flags set

Method Detail

load

public AVModel load(URL url)
             throws IOException

Load a model from the given URL.

Specified by:

load in interface AVLoader

Parameters:

url - The url to load the model from

Returns:

A representation of the model at the URL

Throws:

IOException - something went wrong while reading the file

load

public AVModel load(InputStream stream)
             throws IOException

Load a model from the given input stream. If the file format would prefer to use a Reader interface, then use the InputStreamReader to convert this stream to the desired type. The caller will be responsible for closing down the stream at the end of this process.

Specified by:

load in interface AVLoader

Parameters:

stream - The stream to load the model from

Returns:

A representation of the model from the stream contents

Throws:

IOException - something went wrong while reading the file

load

public AVModel load(File file)
             throws IOException

Load a model from the given file.

Specified by:

load in interface AVLoader

Parameters:

file - The file instance to load the model from

Returns:

A representation of the model in the file

Throws:

IOException - something went wrong while reading the file

setLoadFlags

public void setLoadFlags(int flags)

Set the flags for which parts of the file that should be loaded. The flags are bit-fields, so can be bitwise OR'd together.

Specified by:

setLoadFlags in interface AVLoader

Parameters:

flags - The collection of flags to use

getLoadFlags

public int getLoadFlags()

Get the current set collection of load flags.

Specified by:

getLoadFlags in interface AVLoader

Returns:

A bitmask of flags that are currently set

keepInternalModel

public void keepInternalModel(boolean enable)

Define whether this loader should also keep around it's internal representation of the file format, if it has one. If kept, this can be retrieved through the AVModel.getRawModel() method and cast to the appropriate class type.

Specified by:

keepInternalModel in interface AVLoader

Parameters:

enable - true to enable keeping the raw model, false otherwise

isInternalModelKept

public boolean isInternalModelKept()

Check to see whether the loader should be currently keeping the internal model.

Specified by:

isInternalModelKept in interface AVLoader

Returns:

true when the internal model should be kept

getHeights

public float[][] getHeights()

Return the height map created for the last stream parsed. If no stream has been parsed yet, this will return null.

Specified by:

getHeights in interface org.j3d.loaders.HeightMapSource

Returns:

The array of heights in [row][column] order or null

getGridStep

public float[] getGridStep()

Fetch information about the real-world stepping sizes that this grid uses.

Specified by:

getGridStep in interface org.j3d.loaders.HeightMapSource

Returns:

The stepping information for width and depth

getOriginLocation

public org.j3d.loaders.HeightMapSourceOrigin getOriginLocation()

Specified by:

getOriginLocation in interface org.j3d.loaders.HeightMapSource

getHeader

public org.j3d.loaders.vterrain.BTHeader getHeader()

Get the header used to describe the last stream parsed. If no stream has been parsed yet, this will return null.

Returns:

The header for the last read stream or null