DEPRECATED. This shader is unsupported, but it may still get installed with Softimage to provide compatibility with older scenes that
use it. It is recommended that you replace unsupported shaders in your scenes with equivalent shaders from the current Softimage
shader library.
Environment (Legacy)
Output: Color (RGB) value
Reproduces environments using a highly reflective ball placed in the center of the environment (where you want most of the
action to take place) and photographed from a number of positions. This effectively captures the whole environment.
To replicate this effect, you should take the images from a horizontal position using a telephoto lens. This is important
because the shader makes the approximation that the ball is being pictured from infinitely far away. If you take more than
one image, they should be distributed with equally separated angular positions. For example, if you want to have four images,
take one at 0 degrees and the others at 90 degrees, 180 degrees, and 270 degrees. Once you digitize the images, you should
crop them so that the perimeter of the ball just touches the edges of the image.
NoteNo render tree connections are possible with this shader.
|
|
When multiple images are used, this value controls how much adjacent pictures blend into each other. This is quite useful,
since the pictures seldom match precisely.
|
|
|
Used to compensate, if for some reason the images were not taken from a horizontal position. It is the amount of elevation
in degrees that the camera has relative to the horizontal with the ball at the origin. For example, if your camera is higher
than the ball so that the ball is in the center of the viewfinder when the camera points 10 degrees downward, set the elevation
to 10 degrees. This is not useful for multiple images, since you cannot control individual images this way.
|
|
|
Similar to elevation, this parameter sets the inclination (or twist) of the camera if it was not positioned horizontally.
For example, if the "Elevation" was 0 degrees and the horizon didn't appear horizontal in the viewfinder, this parameter should
be adjusted. If the horizon appears to slope downward to the right in the viewfinder, adjust the twist to a positive value.
The Elevation and Inclination have the same effect on every image used. It is not possible to make corrections for individual
images. These parameters are, however, very useful when only one source image is used to rotate the environment.
|
