according to Axis Systems used in Blender and Cycles - #14 by Subrahmanya
cycles uses a “left-handed coordinate system looking down the +Z axis (when both have +X to the right and +Y upwards)”. Can someone verify this again?
What is the system for the raster and pupil coordinates here:
Is x to the right and y down for the raster and pupil coordinates (centered for the pupil)? I cannot figure out if the
rastertocamera transformation involves the corresponding vertical axis flip. Another question that I have is: are the raster positions indexed from zero?
Thx for any info or pointers to the right info in advance.
Y is up also for raster, there is no vertical flip.
“Pupil coordinates” appears to be a term from VR/AR. In that context I only saw it being used to refer to a position, not a coordinate space.
The raster coordinate is 0,0 at the bottom left of the viewplane,
Thx that clarifies a lot.
What i meant with
pupil coordinate is actually the
lens_uv. The position in the aperture during the ray sampling for a raster position
(x, y) and an aperture.
My question here is, if the same convention with
y up and
x right is used here as well.
Thank you again, that helped a lot.
The aperture computation is done in camera space, and
lens_uv is a position in camera space. In this space X is right and Y is up.
Thank you for the explanation.