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A texdata is a procedurally defined perturbation of the surface normal, controlled by the values in a data file. The values of the X, Y, and Z perturbation expressions are added to the X, Y, and Z components of the original normal vector.
![[Texdata Parameters Dialog]](images/texdatadef.gif)
Function File:
This pop-up list offers all function files known to the
system for selection.
Edit...
Start the text editor that was configured in the project
preferences to edit the function file.
New...
Create a new function file, and start the text editor
to edit it.
Perturbation Vector:
The values that shift the surface normal vector in
each coordinate direction.
Those can be selected from the variables in the
function file as selected above.
X/Y/Z Data File:
The data files where the above functions read their
values from. All three files should contain data
of the same number of dimensions. The X data file
is taken as reference and a warning is issued if a
file of a different number of dimensions is selected
for the green or blue data file.
Index Variables:
Select the variables here that the function file uses
to index into each data file. Up to three variables
are available, depending on the number of dimensions
of the selected data files.
Real Arguments
Rayfront will check the selected function file to
decide how many real arguments the material definition
should supply. If this number is greater than the
mandatory arguments specifying the basic properties,
then the expected number of entry fields in the list
is made available. Supplying those arguments is
optional, but failing to do so may result in runtime
errors when the selected function relies on a specific
argument which is not set.
The Transformation page of the dialog can be used to transform the vector, possibly to bring it in alignment with the geometry of the surface the texture modifies.
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