Car Body Mods - Revision history

Hannah: /* FAQ */

2025-05-01T05:42:45Z

FAQ

Hannah: /* FAQ */

2025-05-01T05:38:26Z

FAQ

← Older revision		Revision as of 22:38, 30 April 2025
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	'''A:''' Refer back to [[Car Body Mods#UV Unwrapping\|the UV unwrapping section]], where this problem is addressed.		'''A:''' Refer back to [[Car Body Mods#UV Unwrapping\|the UV unwrapping section]], where this problem is addressed.

			=== Q: I get "Error: Duplicate Body Variant UIDs found. Unable to generate previews without fixing UID issues. Check log for more information." when generating my thumbnail. ===
			A: Open the <code>Output Log</code> from <code>Window</code> (in the top bar) > <code>Developer Tools</code> > <code>Output Log</code>, and check the log message. There should be a line near the end which reads like so:

			<code>LogBlueprintUserMessages: [None] Error! Duplicate Body UIDs found. These bodies have identical GUIDs: : Asset Name: 00sGPV4DoorXL_BP_Preview , GUID: 2C9829064697871B4EB450BE517F1636 , File Path: /Game/Cars/Blueprints/BodyEditors/Thumbnails/00sGPV4DoorXL_BP/00sGPV4DoorXL_BP_Preview.00sGPV4DoorXL_BP_Preview and: Asset Name: 00sGPV4DoorXL_BP_Preview , GUID: 2C9829064697871B4EB450BE517F1636 , File Path: /Game/DeveloperSandbox/00sGPV4DoorXL_BP_Preview.00sGPV4DoorXL_BP_Preview</code>

			Note how two different assets, in this case both with the same name, exists in two different file locations, with the same GUID. To fix the error, change one of the GUIDs for one of the files. Every car should have its own unique GUID.

			=== Q: I get "Error: Car Body is missing some material slots! It may not work correctly. ===
			A: The <code>Thumbnail Generator</code> automatically checks for certain materials on your body, to ensure things work correctly in Automation, and in the exporter. Things like the <code>BonnetCam</code> and <code>DriverCam</code> materials, whether your car has a <code>Plastic</code> material for the underbody, etc.

			Open your car body skeletal mesh file from your mod content folder and check the material assignments. If you are missing any unexpected materials, check your source files in Blender/etc.. and ensure the files were exported correctly.

			If you have all material slots you were expecting to see, and the error message is simply being over-cautious and you do not want to have any of these materials on your car, you can safely ignore this message.

			If the message is annoying you, expand the details menu of the <code>BodyEditSceneBlutility</code>, expand the <code>CamsoOnly</code> sub-menu, and clear the offending materials you don't care for from the <code>Body Material Slots To Check</code> array.

Hannah: /* In 3ds Max */

2023-01-20T00:38:14Z

In 3ds Max

← Older revision		Revision as of 17:38, 19 January 2023
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	3: Make sure your export settings look like this image:		3: Make sure your export settings look like this image:

	[[~~index.php?title=~~File:3dsmax_exportsettings_01.gif\|alt=\|frameless\|374x374px]]		[[File:3dsmax_exportsettings_01.gif\|alt=\|frameless\|374x374px]]

	=== In Blender ===		=== In Blender ===

Hannah: /* In 3ds Max */

2023-01-20T00:37:58Z

In 3ds Max

← Older revision		Revision as of 17:37, 19 January 2023
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	3: Make sure your export settings look like this image:		3: Make sure your export settings look like this image:
	[[File:3dsmax_exportsettings_01.gif\|alt=\|~~none\|thumb~~\|374x374px\|Occasionally, you may get warnings on exporting the .FBX that the matrials are not compatible with the chosen format and objects may appear grey. This warning can be ignored, as we use our own materials.]]
			[[index.php?title=File:3dsmax_exportsettings_01.gif\|alt=\|frameless\|374x374px]]

	=== In Blender ===		=== In Blender ===

Hannah: /* The traditional method */

2023-01-20T00:37:12Z

The traditional method

← Older revision		Revision as of 17:37, 19 January 2023
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	# Duplicate the bones for the wheel flares on the opposite side, matching the distance from the centreline. Set the name of the mirrored half to the same as the un-mirrored half with "_opposite" at the end of the name of the bone. Duplicate the bone weighting from the non-mirrored half, rename it to match the mirrored bone, and clear the weighting for each on the opposing side so that the weighting for each wheel flare only includes the respective wheel:		# Duplicate the bones for the wheel flares on the opposite side, matching the distance from the centreline. Set the name of the mirrored half to the same as the un-mirrored half with "_opposite" at the end of the name of the bone. Duplicate the bone weighting from the non-mirrored half, rename it to match the mirrored bone, and clear the weighting for each on the opposing side so that the weighting for each wheel flare only includes the respective wheel:
	[[File:Flip_UVs_part_1.png\|alt=\|frameless\|300x300px]]		[[File:Flip_UVs_part_1.png\|alt=\|frameless\|300x300px]]

	[[File:Flip_uv_part_2.png\|alt=\|frameless\|300x300px]]		[[File:Flip_uv_part_2.png\|alt=\|frameless\|300x300px]]

Hannah: /* The traditional method */

2023-01-20T00:36:49Z

The traditional method

← Older revision		Revision as of 17:36, 19 January 2023
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	# If you've already unwrapped your mesh without mirroring the UV maps via modifier setitngs, select the mirrored half, and flip the UV of that half along the Y axis:		# If you've already unwrapped your mesh without mirroring the UV maps via modifier setitngs, select the mirrored half, and flip the UV of that half along the Y axis:
	# Duplicate the bones for the wheel flares on the opposite side, matching the distance from the centreline. Set the name of the mirrored half to the same as the un-mirrored half with "_opposite" at the end of the name of the bone. Duplicate the bone weighting from the non-mirrored half, rename it to match the mirrored bone, and clear the weighting for each on the opposing side so that the weighting for each wheel flare only includes the respective wheel:		# Duplicate the bones for the wheel flares on the opposite side, matching the distance from the centreline. Set the name of the mirrored half to the same as the un-mirrored half with "_opposite" at the end of the name of the bone. Duplicate the bone weighting from the non-mirrored half, rename it to match the mirrored bone, and clear the weighting for each on the opposing side so that the weighting for each wheel flare only includes the respective wheel:
	[[~~index.php?title=~~File:Flip_UVs_part_1.png\|alt=\|frameless\|300x300px]][[~~index.php?title=~~File:Flip_uv_part_2.png\|alt=\|frameless\|300x300px]]		[[File:Flip_UVs_part_1.png\|alt=\|frameless\|300x300px]]
			[[File:Flip_uv_part_2.png\|alt=\|frameless\|300x300px]]

	[[File:Mirror_weighting.png\|frameless\|240x240px]]		[[File:Mirror_weighting.png\|frameless\|240x240px]]

Hannah: /* The traditional method */

2023-01-20T00:36:08Z

The traditional method

← Older revision		Revision as of 17:36, 19 January 2023
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	# If you've already unwrapped your mesh without mirroring the UV maps via modifier setitngs, select the mirrored half, and flip the UV of that half along the Y axis:		# If you've already unwrapped your mesh without mirroring the UV maps via modifier setitngs, select the mirrored half, and flip the UV of that half along the Y axis:
	# Duplicate the bones for the wheel flares on the opposite side, matching the distance from the centreline. Set the name of the mirrored half to the same as the un-mirrored half with "_opposite" at the end of the name of the bone. Duplicate the bone weighting from the non-mirrored half, rename it to match the mirrored bone, and clear the weighting for each on the opposing side so that the weighting for each wheel flare only includes the respective wheel:		# Duplicate the bones for the wheel flares on the opposite side, matching the distance from the centreline. Set the name of the mirrored half to the same as the un-mirrored half with "_opposite" at the end of the name of the bone. Duplicate the bone weighting from the non-mirrored half, rename it to match the mirrored bone, and clear the weighting for each on the opposing side so that the weighting for each wheel flare only includes the respective wheel:
	[[File:~~Flip UVs part 1~~.png~~\|thumb~~\|alt=\|~~A mirrored mesh before mirroring the unwrap.~~\|300x300px~~\|none~~]][[File:~~Flip uv part 2~~.png~~\|thumb~~\|alt=\|~~A mirrored mesh after mirroring the unwrap.~~\|300x300px~~\|none~~]]		[[index.php?title=File:Flip_UVs_part_1.png\|alt=\|frameless\|300x300px]][[index.php?title=File:Flip_uv_part_2.png\|alt=\|frameless\|300x300px]]

	[[File:Mirror_weighting.png\|frameless\|240x240px]]		[[File:Mirror_weighting.png\|frameless\|240x240px]]

Hannah: /* Doing the pelt unwrap */

2023-01-20T00:35:25Z

Doing the pelt unwrap

← Older revision		Revision as of 17:35, 19 January 2023
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	Next we need to orient the unwrap so that the centre of the car in the UV sits on the centre-line of the Y axis, and scale the unwrap up so that it covers as much of the UV space as possible:		Next we need to orient the unwrap so that the centre of the car in the UV sits on the centre-line of the Y axis, and scale the unwrap up so that it covers as much of the UV space as possible:

	[[~~index.php?title=~~File:Car_unwrap_step_2.png\|alt=\|frameless\|360x360px]]		[[File:Car_unwrap_step_2.png\|alt=\|frameless\|360x360px]]
	* Make sure this unwrap exists on both the first ''and'' second UV channels. The first channel will be used to calculate the normals, and the second channel will be used to calculate the fixture cutouts.		* Make sure this unwrap exists on both the first ''and'' second UV channels. The first channel will be used to calculate the normals, and the second channel will be used to calculate the fixture cutouts.
	* make sure the car's center line is exactly in the middle of the UV layout.		* make sure the car's center line is exactly in the middle of the UV layout.

Hannah: /* Doing the pelt unwrap */

2023-01-20T00:35:07Z

Doing the pelt unwrap

← Older revision		Revision as of 17:35, 19 January 2023
Line 467:		Line 467:

	Next we need to orient the unwrap so that the centre of the car in the UV sits on the centre-line of the Y axis, and scale the unwrap up so that it covers as much of the UV space as possible:		Next we need to orient the unwrap so that the centre of the car in the UV sits on the centre-line of the Y axis, and scale the unwrap up so that it covers as much of the UV space as possible:
	[[File:Car_unwrap_step_2.png\|alt=\|none\|thumb\|360x360px\|It is ''vital'' that the top and bottom halves of the unwrap here are perfectly symmetrical, and that the centre line of the car is perfectly straight along the middle.]]

			[[index.php?title=File:Car_unwrap_step_2.png\|alt=\|frameless\|360x360px]]
	* Make sure this unwrap exists on both the first ''and'' second UV channels. The first channel will be used to calculate the normals, and the second channel will be used to calculate the fixture cutouts.		* Make sure this unwrap exists on both the first ''and'' second UV channels. The first channel will be used to calculate the normals, and the second channel will be used to calculate the fixture cutouts.
	* make sure the car's center line is exactly in the middle of the UV layout.		* make sure the car's center line is exactly in the middle of the UV layout.

Hannah: /* Notes */

2022-12-07T02:38:05Z

Notes

← Older revision		Revision as of 19:38, 6 December 2022
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	* Use quads as much as possible, as they shade and reflect better than triangles.		* Use quads as much as possible, as they shade and reflect better than triangles.
	* The body must be single-sided and must not have backfaces. It is made double-sided by materials in UE4.		* The body must be single-sided and must not have backfaces. It is made double-sided by materials in UE4.
	<gallery>		<gallery mode="nolines" widths="300" heights="240">
	File:NewCarTopView.jpg		File:NewCarTopView.jpg
	File:NewCarSideView.jpg		File:NewCarSideView.jpg

← Older revision		Revision as of 22:42, 30 April 2025
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	== FAQ ==		== FAQ ==
	~~'''Q''': I get a Max Script error running the script to unwrap my body like so:~~

			=== '''Q''': I get a Max Script error running the script to unwrap my body like so: ===
	[[File:Maxscript_Err_Unwrap.png\|frameless\|240x240px]]		[[File:Maxscript_Err_Unwrap.png\|frameless\|240x240px]]

	'''A''': Car bodies in UE use 3 UVW maps and your mesh currently has less. To ensure you have enough maps, take the [[Car Body Mods/unwraperror\|following steps]].		'''A''': Car bodies in UE use 3 UVW maps and your mesh currently has less. To ensure you have enough maps, take the [[Car Body Mods/unwraperror\|following steps]].

	'''Q''': I get a Max Script error running the script to mirror my body like so:		=== '''Q''': I get a Max Script error running the script to mirror my body like so: ===

	[[File:Vertex index error.png\|frameless\|240x240px]]		[[File:Vertex index error.png\|frameless\|240x240px]]

	'''A''': Save the body file as is, close 3ds Max, and then reopen the file. This fixes most instances of this error.		'''A''': Save the body file as is, close 3ds Max, and then reopen the file. This fixes most instances of this error.

	'''Q:''' Unreal won't open the SDK project files.		=== '''Q:''' Unreal won't open the SDK project files. ===

	'''A:''' Make sure you're running the correct version of Unreal Editor. It should be version <u>4.24.3</u>.		'''A:''' Make sure you're running the correct version of Unreal Editor. It should be version <u>4.24.3</u>.

	'''Q:''' I got my body in the game, but it looks weird whenever I apply fixtures.		=== '''Q:''' I got my body in the game, but it looks weird whenever I apply fixtures. ===

	'''A:''' Refer back to [[Car Body Mods#UV Unwrapping\|the UV unwrapping section]], where this problem is addressed.		'''A:''' Refer back to [[Car Body Mods#UV Unwrapping\|the UV unwrapping section]], where this problem is addressed.

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	A: Open the <code>Output Log</code> from <code>Window</code> (in the top bar) > <code>Developer Tools</code> > <code>Output Log</code>, and check the log message. There should be a line near the end which reads like so:		A: Open the <code>Output Log</code> from <code>Window</code> (in the top bar) > <code>Developer Tools</code> > <code>Output Log</code>, and check the log message. There should be a line near the end which reads like so:

	<code>LogBlueprintUserMessages: [None] Error! Duplicate Body UIDs found. These bodies have identical GUIDs: : Asset Name: 00sGPV4DoorXL_BP_Preview , GUID: ~~2C9829064697871B4EB450BE517F1636~~ , File Path: /Game/Cars/Blueprints/BodyEditors/Thumbnails/00sGPV4DoorXL_BP/00sGPV4DoorXL_BP_Preview.00sGPV4DoorXL_BP_Preview and: Asset Name: 00sGPV4DoorXL_BP_Preview , GUID: ~~2C9829064697871B4EB450BE517F1636~~ , File Path: /Game/DeveloperSandbox/00sGPV4DoorXL_BP_Preview.00sGPV4DoorXL_BP_Preview</code>		<code>LogBlueprintUserMessages: [None] Error! Duplicate Body UIDs found. These bodies have identical GUIDs: : Asset Name: 00sGPV4DoorXL_BP_Preview , GUID: 1431959a9c074d298d1787a59687f0fd, File Path: /Game/Cars/Blueprints/BodyEditors/Thumbnails/00sGPV4DoorXL_BP/00sGPV4DoorXL_BP_Preview.00sGPV4DoorXL_BP_Preview and: Asset Name: 00sGPV4DoorXL_BP_Preview , GUID: 1431959a9c074d298d1787a59687f0fd, File Path: /Game/DeveloperSandbox/00sGPV4DoorXL_BP_Preview.00sGPV4DoorXL_BP_Preview</code>

	Note how two different assets, in this case both with the same name, exists in two different file locations, with the same GUID. To fix the error, change one of the GUIDs for one of the files. Every car should have its own unique GUID.		Note how two different assets, in this case both with the same name, exists in two different file locations, with the same GUID. To fix the error, change one of the GUIDs for one of the files. Every car should have its own unique GUID.