0006393: Heat haze ignores volumetric light

ID	Project	Category	View Status	Date Submitted	Last Update

0006393	The Dark Mod	Animation	public	30.12.2023 17:07	24.01.2024 00:11

Reporter	Fiver	Assigned To	stgatilov
Priority	low	Severity	normal	Reproducibility	always
Status	closed	Resolution	not fixable
Platform	Linux	OS	Debian	OS Version	11 Bullseye

Summary	0006393: Heat haze ignores volumetric light
Description	In Training Mission, the torch near the book emits heat which distorts the light passing through the hot air, which is a great visual effect. But when the heat covers the volumetric light from the window then the heat effect covers the volumetric light so it looks as if the volumetric light is not there. This also makes the edge of the heated air animation obvious (rather than a smooth transition to non-heated air), and thus the animation loop is revealed. Reproduced in TDM 2.12/64 #10584 (beta212-01).
Steps To Reproduce	In Training Mission, stand behind the book with the flame between the player and the volumetric light (355.46 -1775.82 250.78 -12.2 -65.8 0.0).
Tags	lighting, model

stgatilov 21.01.2024 16:59 administrator ~0016393	This is NOT volumetric light, this is simple translucent geometry "func_static_59". This translucent geometry has material "textures/darkmod/sfx/moon_light_rays", which has "sort last". It was added in svn rev 16354 by nbohr1more. For this reason, this is rendered AFTER framebuffer is copied to texture for heathaze effects. However, if it has lower order and was rendered before framebuffer copy, the same scene would look right from this location, but wrong from the other side. This is a major limitation of the engine and no generic solution has been proposed yet.

stgatilov 21.01.2024 16:59 administrator ~0016394	Closing this as "can't fix".

Date Modified	Username	Field	Change
30.12.2023 17:07	Fiver	New Issue
30.12.2023 17:07	Fiver	Tag Attached: lighting
30.12.2023 17:07	Fiver	Tag Attached: model
30.12.2023 17:13	Fiver	Description Updated
30.12.2023 20:16	Fiver	Relationship added	related to 0005889
30.12.2023 20:17	Fiver	Relationship added	related to 0005816
21.01.2024 16:59	stgatilov	Note Added: 0016393
21.01.2024 16:59	stgatilov	Assigned To	=> stgatilov
21.01.2024 16:59	stgatilov	Status	new => closed
21.01.2024 16:59	stgatilov	Resolution	open => won't fix
21.01.2024 16:59	stgatilov	Note Added: 0016394
21.01.2024 17:17	stgatilov	Resolution	won't fix => not fixable
24.01.2024 00:10	Fiver	Tag Attached: 0006455
24.01.2024 00:11	Fiver	Tag Detached: 0006455
24.01.2024 00:11	Fiver	Relationship added	related to 0006455

related to	0005889	new		Finalize volumetric fog lights
related to	0005816	resolved	duzenko	Volumetric lights (aka "god rays")
related to	0006455	new		Feature request: toggle option for Volumetric lights