HDR map - the file name of the high
dynamic range image. Currently only .hdr and .rad files are supported.
Browse - click this button to browse for an
HDR image.
Overall multiplier - a control for the
overall brightness of the image. This multiplier affects both rendering and
the material edtior.
Render multiplier - controls the
brightness of the HDRI image only when rendering; it has no effect on the
display of the image in the material editor.
Horiz. rotation - allows rotation of the
environment map left and right.
Flip horizontally - flips the environment
horizontally.
Vert. rotation - allows rotation of the
environment map up and down.
Flip vertically - flips the environment
vertically.
Gamma - a gamma-correction value for the
HDRI image.
Map type - chooses the environment mapping
type.