TKE_Texture
Opcode
ASCII |
t |
Hexadecimal |
74 |
Decimal |
116 |
Operands
Byte name_length,
(name_length)xByte name,
Byte image_length,
(image_length)xByte image_name,
Short options,
[Byte parameter_source],
[Byte tiling],
[Byte interpolation],
[Byte decimation],
[Byte red_mapping],
[Byte green_mapping],
[Byte blue_mapping],
[Byte alpha_mapping],
[Byte param_function],
[Byte layout],
[(2)xByte value_scale],
[Byte transform_length],
[(transform_length)xByte transform_segment]
name_length |
length of texture name string |
name |
name of texture |
image_length |
length of image name string |
image_name |
name of image on which the texture is based |
options |
flags indicating optional fields |
parameter_source |
initial values used for texture lookup, usually UV parametric values |
tiling |
indicates how parameter values outside the 0-1 range are handled. |
interpolation |
indicates texture sampling when a texture pixel spans multiple display pixels |
decimation |
indicates texture sampling when a display pixel covers multiple texture pixels |
red_mapping |
enumeration of source choices for red value |
green_mapping |
enumeration of source choices for green value |
blue_mapping |
enumeration of source choices for blue value |
alpha_mapping |
enumeration of source choices for alpha value |
param_function |
initial remapping function for parameter values |
layout |
arrangement of useful picture data within the image |
value_scale |
amount to scale and shift color values |
transform_length |
length of transform segment name |
transform_segment |
name of a segment containing an additional texture_matrix to apply |
Notes
Textures define a form of image which can be stretched and applied to a surface. The simplest form
is indeed just an image; as each pixel on the surface is drawn, a color is selected from a corresponding spot on the
image. The options allow for changes to
the correspondence between points, and/or changes to the color selected.
For the specific definitions on
what the various texture option bits mean in HOOPS/3dGS please refer to the
Define_Texture
specification in the 3dGS Reference Manual.
Option bits:
0001 |
Parameter Source |
0002 |
Tiling |
0004 |
Interpolation |
0008 |
Decimation |
0010 |
Red Channel Mapping |
0020 |
Green Channel Mapping |
0040 |
Blue Channel Mapping |
0080 |
Alpha Channel Mapping |
0100 |
Parameter Function |
0200 |
Layout |
0400 |
Transform Segment Name |
0800 |
Value Scale |
1000 |
Caching |
Parameter Sources:
0 |
U |
1 |
UV |
2 |
UVW |
3 |
Object Space XYZ |
4 |
World Space XYZ |
5 |
Surface Normal |
6 |
Reflection Vector |
7 |
Natural UV |
8 |
Local Pixels |
9 |
Outer Pixels |
10 |
Local Window |
11 |
Outer Window |
Parameter Functions:
0 |
None |
1 |
Sphere |
2 |
Cylinder |
3 |
Box |
Parameter Layouts:
0 |
Rectilinear |
1 |
Spherical |
2 |
Hemispherical |
3 |
Cubic Faces |
Parameter Tilings:
0 |
None |
1 |
Clamp |
2 |
Repeat |
3 |
Mirror |
Texture Filters:
0 |
None |
1 |
Bilinear |
2 |
Trilinear |
3 |
MipMap |
4 |
Summed Areas |
5 |
Gaussian |
6 |
Stochastic |
Channel Mappings:
0 |
Red |
1 |
Green |
2 |
Blue |
3 |
Alpha |
4 |
Zero |
5 |
One |
6 |
Luminance |
7 |
None |
|