Add Henyey-Greenstein Phase Function #26

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opened 2026-01-18 14:24:06 +00:00 by akadmin · 0 comments

akadmin commented

2026-01-18 14:24:06 +00:00

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Description:
Implement anisotropic scattering to create silver lining effect when looking toward the sun.
Tasks:

Implement Henyey-Greenstein phase function
Calculate angle between view and light direction
Apply phase function to light samples
Add forward scattering parameter (g value ~0.7)
Test silver lining appearance
Verify effect varies with view angle

Acceptance Criteria:

Silver lining visible around sun through clouds
Effect stronger when looking toward sun
Clouds brighter on sun-facing side
Phase function parameter tunable

Related Issues: Depends on #25
Resources:

Horizon paper phase function section

Estimated Time: 1-2 days

Description: Implement anisotropic scattering to create silver lining effect when looking toward the sun. Tasks: - [x] Implement Henyey-Greenstein phase function - [x] Calculate angle between view and light direction - [x] Apply phase function to light samples - [x] Add forward scattering parameter (g value ~0.7) - [x] Test silver lining appearance - [x] Verify effect varies with view angle Acceptance Criteria: Silver lining visible around sun through clouds Effect stronger when looking toward sun Clouds brighter on sun-facing side Phase function parameter tunable Related Issues: Depends on #25 Resources: Horizon paper phase function section Estimated Time: 1-2 days