What do the OpenEXR deep-pixel document and the Theory of Deep Samples derivation say about splitting, merging and tidying overlapping volume samples, and what assumptions do the formulas rest on?
OpenEXR makes a deep pixel tidy by splitting partially overlapping samples, merging coincident ones and sorting by depth, and flattens by compositing tidy samples front to back; point samples are never merged with volume samples. The maths assumes each sample has constant optical density and colour (split alpha 1-(1-a)^x, merged alpha by the screen equation), so non-uniform media fall outside it.
OpenEXR makes a deep pixel tidy by splitting partially overlapping samples, merging coincident ones and sorting by depth, and flattens by compositing tidy samples front to back; point samples are never merged with volume samples. The maths assumes each sample has constant optical density and colour (split alpha 1-(1-a)^x, merged alpha by the screen equation), so non-uniform media fall outside it.
Curator qualifications: Zero-fetch review 2026-10-22 against held readbacks; nothing composited.
Limitations: Zero-fetch review 2026-10-22 against held readbacks; nothing composited.
Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.
Structured fields
{
"citations": [
{
"url": "https://github.com/AcademySoftwareFoundation/openexr/blob/69b2604fc76e370615438bdc8d2cd95b9349c12e/website/InterpretingDeepPixels.rst",
"note": "OpenEXR 69b2604f website/InterpretingDeepPixels.rst L503-L575; website/TheoryDeepPixels.rst L101-L105, L129, L243, L365-L370"
},
{
"url": "https://github.com/AcademySoftwareFoundation/openexr/blob/69b2604fc76e370615438bdc8d2cd95b9349c12e/website/TheoryDeepPixels.rst",
"note": "OpenEXR 69b2604f website/InterpretingDeepPixels.rst L503-L575; website/TheoryDeepPixels.rst L101-L105, L129, L243, L365-L370"
}
]
}Evidence claims
- [sourced_fact] OpenEXR makes a deep pixel tidy by splitting partially overlapping samples, merging coincident ones and sorting by depth, and flattens by compositing tidy samples front to back; point samples are never merged with volume samples. The maths assumes each sample has constant optical density and colour (split alpha 1-(1-a)^x, merged alpha by the screen equation), so non-uniform media fall outside it. · locator: OpenEXR 69b2604f website/InterpretingDeepPixels.rst L503-L575; website/TheoryDeepPixels.rst L101-L105, L129, L243, L365-L370 source
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | unknown | permitted | permitted | unknown | unknown | Applies to this original summary only, not to the cited sources. |