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# SoSFImage3 Class Reference
[Field classes]

`#include <Inventor/fields/SoSFImage3.h>`

Inheritance diagram for SoSFImage3:

List of all members.

## Detailed Description

The SoSFImage3 class is used to store 3D (volume) images.

The SoSFImage3 class provides storage for inline 3D image maps. 3D images in Coin are mainly used for 3D texture mapping support.

SoSFImage3 instances can be exported and imported as any other field class in Coin.

The components of an SoSFImage3 is: its image dimensions (width, height and depth), the number of bytes used for describing each pixel (number of components) and an associated pixel buffer. The size of the pixel buffer will be width*height*depth*components.

For texture maps, the components / bytes-per-pixel setting translates as follows: use 1 for a grayscale imagemap, 2 for grayscale + opacity (i.e. alpha value), 3 for RGB (1 byte each for red, green and blue) and 4 components means 3 bytes for RGB + 1 byte opacity value (aka RGBA).

This field is serializable into the Inventor / Coin file format in the following manner:

      FIELDNAME X Y Z C 0xRRGGBBAA 0xRRGGBBAA ...

"X", "Y" and "Z" are the image dimensions along the given axes, "C" is the number of components in the image. The number of 0xRRGGBBAA pixel color specifications needs to equal the exact number of pixels, which is X*Y*Z. Each part of the pixel color value is in the range 0x00 to 0xff (hexadecimal, 0 to 255 decimal).

For 3-component images, the pixel-format is 0xXXRRGGBB, where the byte in the pixel color value marked as "XX" is ignored and can be left out.

For 2-component images, the pixel-format is 0xXXXXGGAA, where the bytes in the pixel color values marked as "XX" are ignored and can be left out. "GG" is the part which gives a grayscale value and "AA" is for opacity.

For 1-component images, the pixel-format is 0xXXXXXXGG, where the bytes in the pixel color values marked as "XX" are ignored and can be left out.

The pixels are read as being ordered in rows along X (width), columns along Y (height, bottom to top) and Z "planes" (depth, front to back).

Here's a simple example of the file format serialization, for a 2x2x2 RGB-image inside an SoTexture3 node:

      Texture3 {
             images 2 2 2 3

             0x000000 0x00ff00
             0xff0000 0xffff00

             0x000000 0x0000ff
             0x00ff00 0x00ffff
      }

The image above is colored black+green on the first line and red+yellow on the second line in the first Z plane. The second Z plane is colored black+blue on the first line and green+cyan on the second line.

Be aware that this class is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

See also:
  SoTexture3, SoSFImage

Since:
  Coin 2.0

  TGS Inventor 2.6

## Public Member Functions
const unsigned char * | getValue (SbVec3s &size, int &nc) const
void | setValue (const SbVec3s &size, const int nc, const unsigned char *bytes)
int | operator== (const SoSFImage3 &field) const
int | operator!= (const SoSFImage3 &field) const
unsigned char * | startEditing (SbVec3s &size, int &nc)
void | finishEditing (void)
## Static Public Member Functions
void | initClass (void)

## Member Function Documentation

void SoSFImage3::initClass | ( | void |  | ) | `[static]`

| Internal method called upon initialization of the library (from SoDB::init()) to set up the type system. Reimplemented from SoSField.

const unsigned char * SoSFImage3::getValue | ( | SbVec3s & | size,
|  | int & | nc
| ) | const

| Return pixel buffer, set size to contain the image dimensions and nc to the number of components in the image.

void SoSFImage3::setValue | ( | const SbVec3s & | size,
|  | const int | nc,
|  | const unsigned char * | bytes
| ) |

| Initialize this field to size and nc. If bytes is not `NULL`, the image data is copied from bytes into this field. If bytes is `NULL`, the image data is cleared by setting all bytes to 0 (note that the behavior on passing a `NULL` pointer is specific for Coin, Open Inventor will crash if you try it).

int SoSFImage3::operator== | ( | const SoSFImage3 & | field | ) | const

| Compare image of field with the image in this field and return `TRUE` if they are equal.

int SoSFImage3::operator!= | ( | const SoSFImage3 & | field | ) | const`[inline]`

| Compare image of field with the image in this field and return `FALSE` if they are equal.

unsigned char * SoSFImage3::startEditing | ( | SbVec3s & | size,
|  | int & | nc
| ) |

| Return pixel buffer, set size to contain the image dimensions and nc to the number of components in the image. The field's container will not be notified about the changes until you call finishEditing().

void SoSFImage3::finishEditing | ( | void |  | ) |

| Notify the field's auditors that the image data has been modified.

The documentation for this class was generated from the following files:

- SoSFImage3.h
- SoSFImage3.cpp