[Radiance-general] Fwd: Defining UP Vector to BSDF Material

[Shashanka Sri Nagaveera Sunkara]

hello,

I am trying to use BSDF data generated from photogoniometer reading . 
while defing the BSDF material in .mat file.

void BSDF m_bsdf_mat

6 0 data.xml ux uy uz func.file

0

0

the up vector is to be defined. Can I know what does this up vector 
mean? how does it influence the surface types. does -t -rz -rx -ry 
effect the defination. how to define an up vector for a sphere/bubble.?

Thank you

Regards,

Shashanka Sunkara

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