fix incorrect opacity accumulation in volumes

jeffamstutz · jeffamstutz · commit 213f4d9dfd82 · 2025-02-18T17:19:24.000-06:00
diff --git a/devices/rtx/gpu/volumeIntegration.h b/devices/rtx/gpu/volumeIntegration.h
@@ -93,7 +93,7 @@ VISRTX_DEVICE void _rayMarchVolume(ScreenSample &ss,
 
       if (color)
         *color += transmittance * (1.f - stepTransmittance) * vec3(co);
-      opacity += transmittance * (1.f - stepTransmittance) * co.w;
+      opacity += transmittance * (1.f - stepTransmittance);
 
       transmittance *= stepTransmittance;
     }

Original file line number	Diff line number	Diff line change
`@@ -93,7 +93,7 @@ VISRTX_DEVICE void _rayMarchVolume(ScreenSample &ss,`
`93`	`93`
`94`	`94`	`if (color)`
`95`	`95`	`color += transmittance (1.f - stepTransmittance) * vec3(co);`
`96`		`- opacity += transmittance * (1.f - stepTransmittance) * co.w;`
	`96`	`+ opacity += transmittance * (1.f - stepTransmittance);`
`97`	`97`
`98`	`98`	`transmittance *= stepTransmittance;`
`99`	`99`	`}`