4-engine Contrails, bug on FS24

[MSFS 2024] Bug Reports
1

On FS2024, aircraft with 4 engines are having various inconsistencies with contrail effects.

I’m using the default Asobo contrail effects

		<Component ID="FX_CONTRAIL_QUAD">
			<UseTemplate Name="ASOBO_CONTRAIL_QUAD_FX">
				<FX_NAME>FX_CONTRAIL_QUAD_LEFT_OUT</FX_NAME>
				<FX_NODE>fx_exhaust_1</FX_NODE>
				<FX_ENGINE_ID>1</FX_ENGINE_ID>
			</UseTemplate>
			<UseTemplate Name="ASOBO_CONTRAIL_QUAD_FX">
				<FX_NAME>FX_CONTRAIL_QUAD_LEFT_IN</FX_NAME>
				<FX_NODE>fx_exhaust_2</FX_NODE>
				<FX_ENGINE_ID>2</FX_ENGINE_ID>
			</UseTemplate>
			<UseTemplate Name="ASOBO_CONTRAIL_QUAD_FX">
				<FX_NAME>FX_CONTRAIL_QUAD_RIGHT_IN</FX_NAME>
				<FX_NODE>fx_exhaust_3</FX_NODE>
				<FX_ENGINE_ID>3</FX_ENGINE_ID>
			</UseTemplate>
			<UseTemplate Name="ASOBO_CONTRAIL_QUAD_FX">
				<FX_NAME>FX_CONTRAIL_QUAD_RIGHT_OUT</FX_NAME>
				<FX_NODE>fx_exhaust_4</FX_NODE>
				<FX_ENGINE_ID>4</FX_ENGINE_ID>
			</UseTemplate>
		</Component>
		<Component ID="FX_CONTRAIL_RIBBON">
			<UseTemplate Name="ASOBO_CONTRAIL_RIBBON_FX">
				<FX_NAME>FX_CONTRAIL_RIBBON_LEFT</FX_NAME>
				<FX_NODE>fx_exhaust_1</FX_NODE>
				<FX_CODE>(A:CONTRAILS CONDITIONS MET:1, Bool) (A:GENERAL ENG COMBUSTION:1, Bool) and (A:CONTRAILS CONDITIONS MET:2, Bool) (A:GENERAL ENG COMBUSTION:2, Bool) and or</FX_CODE>
			</UseTemplate>
			<UseTemplate Name="ASOBO_CONTRAIL_RIBBON_FX">
				<FX_NAME>FX_CONTRAIL_RIBBON_RIGHT</FX_NAME>
				<FX_NODE>fx_exhaust_4</FX_NODE>
				<FX_CODE>(A:CONTRAILS CONDITIONS MET:3, Bool) (A:GENERAL ENG COMBUSTION:3, Bool) and (A:CONTRAILS CONDITIONS MET:4, Bool) (A:GENERAL ENG COMBUSTION:4, Bool) and or</FX_CODE>
			</UseTemplate>
		</Component>

This is the same template used in the stock MSFS2020 B747. The effects detach from the FX_NODE on each engine upon switching cameras.

Aircraft is at 26,000 ft, climbing to 30,000 ft (roughly where the contrail conditions begin). Flying from the exterior camera, I can clearly see when the contrails appear for the first time.

image
image1253×369 40.8 KB

I go back to the cockpit view for a few seconds, and back to the exterior. Now all my contrails have detached from the engine and collapsed into the origin node of the aircraft.
image
image1330×692 64 KB

I’ve tried using different nodenames, creating other nodes, etc. Nothing seems to work.
This does not occur on FS20.

2

Perhaps also relevant to add, this does not seem to occur with aircraft with 2 engines, and if I remove two of the effects it doesn’t occur either. Only with all four seems to occur.

3

@FlyingRaccoon any idea?

4

Issue persists on 1.0.86.0

5

Hello @vantech

I suspect the root cause is the same as the one causing the sound issue you reported:
Some sounds stop playing after changing cameras - [MSFS 2024] Bug Reports / Sound - MSFS DevSupport

I would not be surprised if specifying the FX position through offsets rather than node names would give the expected result.

I’ll log it anyway in case this is unrelated.

Regards,
Sylvain

6

Thanks, though interesting that only occurs in +3 engines. Does not occur in 2 engine aircraft.

Will reposition the effects, however, the sound bug has a very high impact.

7

I know how to replicate this bug and it affects 2 engine planes as well. Start a flight, go up in altitude, until you have contrails. Then, what I do, is I hit escape → settings, and for example, enable dev mode, and return to the sim. I will always have one contrail now.

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