3d tutorial of Creating Exhaust Burns in Photoshop and 3ds max by The3dStudio.com

Tutorial Creating Exhaust Burns in Photoshop and 3ds max

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Product ID: 29978

Keywords:	free, photoshop, 3ds, max, tutorial, learning, how, to, help, photoshop, texture, exhaust, burns
Author:	The3dStudio.com \| Author's web site
Added on:	4/24/2007
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Category:	Tutorials > Photoshop
Summary:	Creating Exhaust Burns in Photoshop and 3ds max 3D Tutorial Scroll down to view the tutorial or download an offline version in PDF or XPS format. This tutorial is exclusive to The3dStudio.com, you won't find it anywhere else! (read more)
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * IMPORTANT: To view the tutorial with larger images and screen shots please download the PDF or XPS files. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * This tutorial was written exclusively for The3dStudio.com by Rick Johnston of Dreamscape Studios (Member Link). * Creating Exhaust Burns (in Photoshop and 3ds max) * Exhaust Burn Tutorial Exhaust burns are the effect of hot gases and particles of carbon, oil and other substances that discolor the sheet metal around exhaust pipes. These discolorations increase with age and use of the vehicle and can be found on cars, aircraft and other vehicles with sheet metal in the proximity of the exhaust outlets. The larger the exhaust outlet the larger the area effected by the exhaust burn. The smaller the outlet the inverse is true. Jet exhaust will burn the sheet metal more but put fewer particles on the metal than a reciprocating engine so the result is less dark particles and more blue gray metal from heating. These burns also follow the prevailing air currents and gradually lesson over distance. Jet engine exhaust will lesson faster because the speed they travel through the air cools the metal faster than the reciprocating powered aircraft. You will also notice that these burns will curve and flow along the surface with the airflow. P-51s are a great example. The P-51 has 6 exhaust pipes on either side of the nose and they spew out exhaust just below the shoulder of the nose just ahead of the cockpit. The airflow along the fuselage there is gradually pulled upward only slightly until it reaches a point even with the canopy. It then is pulled downward with the airflow as the cockpit and wing aerodynamics take effect on the airflow along the fuselage. This exhaust burn then gradually nears the back of the wing and disappears as the exhaust is mixed with surrounding air. Fig 1-0 Image showing exhaust discoloration of the fuselage sheet metal aft of the exhaust stacks. Note that the exhaust discoloration follows the natural airflow of the aircraft. The purpose of this short tutorial is to give you some idea of how to make exhaust burns on your sheet metal project and with practice and experience, make it appear realistically. We are providing a model and sheet metal textures to practice this tutorial with. The remaining processes will be included in this tutorial. Applying a heat discoloration to the sheet metal diffuse material Applying a particle discoloration to the sheet metal diffuse material Applying oil streaks on the sheet metal diffuse material Applying Heat Discoloration to the sheet metal diffuse material Open the material called MtlDif.jpg in Photoshop. See Fig 1-0a Fig 1-0a Image of material you will edit. Select the brush tool and change the settings as shown in Fig 1-1 Fig 1-1 Image showing brush manage selection is made with the Activate brush manager and modify the brush settings as follows: Dry Brush Master Diameter 59 px Mode Normal Opacity 19% Flow 29% See Fig 1-1a below. Fig 1-1a Image showing the brush configuration and selection Create a new layer. In the area of the exhaust stacks, you will need to discolor the metal a little to the dark gray blue. This is from the heat of the exhaust and does not go very far from the rear of the stack. Use the brush tool and make the patch of heating discoloration as shown in Fig 1-2. Fig 1-2 Image showing the discoloration patch that has been brushed on. Using the smudge tool with 30% strength and the Blur tool with 100 % strength, edit this patch and blend it to be smoother and more consistent. It should not however be completely consistent. See Fig 1-3. Fig 1-3 Image showing the blended heated discoloration patch after the blur and smudge tool have been used. Applying a particle discoloration to the sheet metal diffuse material Create a new layer and select a new color. The new layer will be for the exhaust particle trail discoloration. The color will be a medium to dark gray. This patch of discoloration will have more effect on the color of the sheet metal because it is substances that adhere to the metal. They will also be apparent longer although gradually fading away to nothing. See Fig 1-4. Fig 1-4 Color Selection is open and the darker gray is selected as the new color. On the right you can also see the new layer in the layer manager window. Now brush in trails of smoke discoloration from the left side of the gray blue patch to the right side of the material. Using the same brush will allow the streaking that naturally occurs from the forward velocity of flight. See Fig 1-5. Fig 1-5 Image showing the exhaust streaking discoloration brushed on. Using the blur tool and the smudge tool, blend the streaks to be less apparent and less diverse. See Fig 1-6. Fig 1-6 Smudge tool and blur tool have blurred the tracks and edges of darker areas somewhat. Now change the opacity to this layer to about 37 % and change the opacity to the layer with the heat discoloration to 24%. This really diminishes the effect and you can increase or decrease these settings to achieve the results you want. See Fig 1-7. Fig 1-7 Image showing the final adjustments to the opacity to the two layers with the discoloration. Applying oil streaks on the sheet metal diffuse material Add a third layer. Open the brush manager again and select a small brush about 6 px of the same type. Leave the other current setting alone. See Fig 1-8. Fig 1-8 Image showing new brush settings in the brush manager. Fig 1-8a Note the brush setting close up provided above in Fig 1-8a Brush is a 5 px dry brush, mode is normal, opacity is 19% and flow is 29%. Carefully brush on tracks of oil from various locations on the material to the right some distance. These tracks should begin at the locations of a few rivets, or cracks between sheet metal. These oil tracks are not usually large and are not generally visible from any distance more than about 30 feet. See Fig 1-9 Fig 1-9 Image showing oil tracks streaked across material from front to back (left to right) starting at rivets screws or breaks between pieces of sheet metal. Now save your work as a jpg overwriting the MTLDif.jpg. Do not close the PSD file without saving it as a PSD so that if need be you can edit it later. Close Photoshop. Open 3D Studio Max Open the file called Exhaust Burn Model.max When you open the file your work (if saved properly) should already have been updated on the material file and will appear on the model initially. See Fig 1-10. Fig 1-10 Render it and determine if you need to make adjustments to the material file in Photoshop. If so make them in Photoshop and reopen the tutorial model. Note the burn discoloration under the exhaust stack. Now practice with the provided materials and then try it on your own projects. Good luck and Good modeling.

Full description

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
IMPORTANT: To view the tutorial with larger images and screen shots please download the PDF or XPS files.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

This tutorial was written exclusively for The3dStudio.com by Rick Johnston of Dreamscape Studios (Member Link).

*** Creating Exhaust Burns (in Photoshop and 3ds max) ***

Exhaust Burn Tutorial

Exhaust burns are the effect of hot gases and particles of carbon, oil and other substances that discolor the sheet metal around exhaust pipes. These discolorations increase with age and use of the vehicle and can be found on cars, aircraft and other vehicles with sheet metal in the proximity of the exhaust outlets.

The larger the exhaust outlet the larger the area effected by the exhaust burn. The smaller the outlet the inverse is true. Jet exhaust will burn the sheet metal more but put fewer particles on the metal than a reciprocating engine so the result is less dark particles and more blue gray metal from heating.

These burns also follow the prevailing air currents and gradually lesson over distance. Jet engine exhaust will lesson faster because the speed they travel through the air cools the metal faster than the reciprocating powered aircraft. You will also notice that these burns will curve and flow along the surface with the airflow. P-51s are a great example. The P-51 has 6 exhaust pipes on either side of the nose and they spew out exhaust just below the shoulder of the nose just ahead of the cockpit. The airflow along the fuselage there is gradually pulled upward only slightly until it reaches a point even with the canopy. It then is pulled downward with the airflow as the cockpit and wing aerodynamics take effect on the airflow along the fuselage. This exhaust burn then gradually nears the back of the wing and disappears as the exhaust is mixed with surrounding air.

Fig 1-0
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Image showing exhaust discoloration of the fuselage sheet metal aft of the exhaust stacks. Note that the exhaust discoloration follows the natural airflow of the aircraft.

The purpose of this short tutorial is to give you some idea of how to make exhaust burns on your sheet metal project and with practice and experience, make it appear realistically.

We are providing a model and sheet metal textures to practice this tutorial with. The remaining processes will be included in this tutorial.

Applying a heat discoloration to the sheet metal diffuse material
Applying a particle discoloration to the sheet metal diffuse material
Applying oil streaks on the sheet metal diffuse material

Applying Heat Discoloration to the sheet metal diffuse material

Open the material called MtlDif.jpg in Photoshop. See Fig 1-0a

Fig 1-0a
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Image of material you will edit.

Select the brush tool and change the settings as shown in Fig 1-1

Fig 1-1
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Image showing brush manage selection is made with the

Activate brush manager and modify the brush settings as follows:
Dry Brush
Master Diameter 59 px
Mode Normal
Opacity 19%
Flow 29%

See Fig 1-1a below.

Fig 1-1a
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Image showing the brush configuration and selection
Create a new layer.

In the area of the exhaust stacks, you will need to discolor the metal a little to the dark gray blue. This is from the heat of the exhaust and does not go very far from the rear of the stack. Use the brush tool and make the patch of heating discoloration as shown in Fig 1-2.

Fig 1-2
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Image showing the discoloration patch that has been brushed on.

Using the smudge tool with 30% strength and the Blur tool with 100 % strength, edit this patch and blend it to be smoother and more consistent. It should not however be completely consistent. See Fig 1-3.

Fig 1-3
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Image showing the blended heated discoloration patch after the blur and smudge tool have been used.

Applying a particle discoloration to the sheet metal diffuse material

Create a new layer and select a new color. The new layer will be for the exhaust particle trail discoloration. The color will be a medium to dark gray. This patch of discoloration will have more effect on the color of the sheet metal because it is substances that adhere to the metal. They will also be apparent longer although gradually fading away to nothing. See Fig 1-4.

Fig 1-4
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Color Selection is open and the darker gray is selected as the new color. On the right you can also see the new layer in the layer manager window.

Now brush in trails of smoke discoloration from the left side of the gray blue patch to the right side of the material. Using the same brush will allow the streaking that naturally occurs from the forward velocity of flight. See Fig 1-5.

Fig 1-5
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Image showing the exhaust streaking discoloration brushed on.

Using the blur tool and the smudge tool, blend the streaks to be less apparent and less diverse. See Fig 1-6.

Fig 1-6
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Smudge tool and blur tool have blurred the tracks and edges of darker areas somewhat.

Now change the opacity to this layer to about 37 % and change the opacity to the layer with the heat discoloration to 24%. This really diminishes the effect and you can increase or decrease these settings to achieve the results you want. See Fig 1-7.

Fig 1-7
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Image showing the final adjustments to the opacity to the two layers with the discoloration.

Applying oil streaks on the sheet metal diffuse material

Add a third layer.

Open the brush manager again and select a small brush about 6 px of the same type. Leave the other current setting alone. See Fig 1-8.

Fig 1-8
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Image showing new brush settings in the brush manager.

Fig 1-8a
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Note the brush setting close up provided above in Fig 1-8a
Brush is a 5 px dry brush, mode is normal, opacity is 19% and flow is 29%.

Carefully brush on tracks of oil from various locations on the material to the right some distance. These tracks should begin at the locations of a few rivets, or cracks between sheet metal. These oil tracks are not usually large and are not generally visible from any distance more than about 30 feet. See Fig 1-9

Fig 1-9
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Image showing oil tracks streaked across material from front to back (left to right) starting at rivets screws or breaks between pieces of sheet metal.

Now save your work as a jpg overwriting the MTLDif.jpg. Do not close the PSD file without saving it as a PSD so that if need be you can edit it later.
Close Photoshop.

Open 3D Studio Max
Open the file called Exhaust Burn Model.max

When you open the file your work (if saved properly) should already have been updated on the material file and will appear on the model initially. See Fig 1-10.

Fig 1-10
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Render it and determine if you need to make adjustments to the material file in Photoshop. If so make them in Photoshop and reopen the tutorial model. Note the burn discoloration under the exhaust stack.

Now practice with the provided materials and then try it on your own projects.

Good luck and Good modeling.