Package com.openinventor.inventor.nodes

Class SoTextureUnit

java.lang.Object

com.openinventor.inventor.Inventor

com.openinventor.inventor.misc.SoBase

com.openinventor.inventor.fields.SoFieldContainer

com.openinventor.inventor.nodes.SoNode

com.openinventor.inventor.nodes.SoTextureUnit

All Implemented Interfaces:

SafeDisposable

public class SoTextureUnit
extends SoNode

Node that specifies the current texture unit and the associated mapping method. This node specifies the current texture unit for all subsequent 2D and 3D texture nodes (for example, SoTexture2, SoTexture2Transform, SoTextureCoordinate2, SoTextureCoordinateBinding, and SoTextureCoordinateFunction).

If the graphics board supports multitexturing (OpenGL 1.5 or GL_ARB_multitexture extension), then multiple textures, each defined by a texture unit, can be applied to the same shape. The maximum number of texture units depends on the board and can be queried using getMaxTextureUnit.

Multitexturing is supported by the following shapes:

• SoCone
• SoCube
• SoCylinder
• SoFaceSet
• SoIndexedFaceSet
• SoIndexedQuadMesh
• SoIndexedTriangleStripSet
• SoQuadMesh
• SoSphere
• SoTriangleStripSet

Each texture unit is defined by the following texture properties:

• image of the texture (derived from SoTexture)
• texture coordinates (SoTextureCoordinate2, SoTextureCoordinate3, SoTextureCoordinateBinding, etc.)
• automatic texture coordinates generation (derived from SoTextureCoordinateFunction)
• stack of matrix transforms (SoTexture2Transform, SoTexture3Transform, SoMatrixTransform, etc.)
• mapping method: image mapping or bump mapping.

Limitations:

• Multitexturing is not supported for non convex shapes (SoShapeHints.UNKNOWN_FACE_TYPE).
• Automatic texture coordinate generation (SoTextureCoordinateFunction) is not possible for the bump mapping method.
• When not using shaders, only units 0 to 3 can be used.
• When using shaders, texture unit properties (listed above) can be defined for units 0 to 7. When shaders are used, it is also possible to use SoVertexShaderParameter to specify texture coordinates to be used by the shader(s). SoVertexShaderParameter parameter sets are limited to 32 on OpenGL3 hardware.

File format/default:

TextureUnit {

unit

0

}

Action behavior:

SoGLRenderAction, SoCallbackAction
Sets the current texture unit and the associated mapping method. Sets: SoTextureUnitElement

SoBumpMappingProperty, SoTexture2, SoTexture2Transform, SoTextureCoordinate2, SoTextureCoordinateBinding, SoTextureCoordinateFunction.

Nested Class Summary

Nested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoNode

SoNode.RenderModes

Nested classes/interfaces inherited from class com.openinventor.inventor.Inventor

Inventor.ConstructorCommand

Field Summary

Fields

Modifier and Type	Field	Description
SoSFUInt32	unit	Specifies the texture unit identifier.

Fields inherited from class com.openinventor.inventor.Inventor

VERBOSE_LEVEL, ZeroHandle

Constructor Summary

Constructors

Constructor	Description
SoTextureUnit()	Constructor.

Method Summary

Modifier and Type	Method	Description
static int	getMaxTextureUnit()	Calls getMaxTextureUnit((com.openinventor.inventor.misc.SoState)null).
static int	getMaxTextureUnit(SoState state)	Returns the maximum number of texture units.

Methods inherited from class com.openinventor.inventor.nodes.SoNode

affectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderEngineMode, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, write

Methods inherited from class com.openinventor.inventor.fields.SoFieldContainer

copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaults

Methods inherited from class com.openinventor.inventor.misc.SoBase

dispose, getName, isDisposable, isSynchronizable, setName, setSynchronizable

Methods inherited from class com.openinventor.inventor.Inventor

getNativeResourceHandle

Methods inherited from class java.lang.Object

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

Field Detail

unit

public final SoSFUInt32 unit

Specifies the texture unit identifier. Can range from 0 to the largest texture unit, which is getMaxTextureUnit()-1. Values greater than the largest texture unit are clamped at the largest texture unit.

Constructor Detail

SoTextureUnit

public SoTextureUnit()

Constructor.

Method Detail

getMaxTextureUnit

public static int getMaxTextureUnit()

Calls getMaxTextureUnit((com.openinventor.inventor.misc.SoState)null).

getMaxTextureUnit

public static int getMaxTextureUnit(SoState state)

Returns the maximum number of texture units. This is the max which can be used when a shader is on state. Without shaders, only the first 4 units (0..3) can be used.