First of all you need the template, we have made this in the final step at the mapping section. (you can read a full description on the tutorial Quick Guide to find out mapping gp4 by Max Downforce.)
Now paint these textures, add logos, add a texture shading... and finaly add an alpha layer (an alpha layer in gp4 means how is the reflection of the light: withe -> all light is reflected and black -> no light is reflected). The best way to make an alpha layer is make all the alpha layer gray and then add some black in the zones that shouldn't reflect the light.

First of all I have painted the background of the car of color blue:

• Texture shading (Top of this page)
  
  Texture shading makes the car better and improves a lot the 3D shading of our car.
  Let's see how to make texture shading for the barge board:
  
  
  
  First of all make a new layer and name it as dark_shading. Select with the poligonal-lasso the section of the texture that you want to add the shading.
  The next steep is paint the interior of this selected part with the Brush Tool with medium opacity in color black.
  After that, with the Eraser Tool and with a very low opacity erase the parts of the dark-painted area to get the correct shading.
  Now make the same for all the parts of the texture that need dark-texture shading.
  Finally, when you have finished to paint all the shadings on the dark_shading layer, aply the Blur Tool to fix some imperfections on the shadings.
  
  The result for my barge board is:
  
  
  
  
  You can make also highlights in the same way, but now create a new layer and name it as light_shading. Select with the poligonal-lasso the section of the texture that you want to add the shading.
  The next steep is paint the interior of this selected part with the Brush Tool with medium opacity in color white.
  After that, with the Eraser Tool and with a very low opacity erase the parts of the light-painted area.
  Now make the same for all the parts of the texture that need light-texture shading.
  Finally, when you have finished to paint all the shadings on the light_shading layer, aply the Blur Tool to fix some imperfections on the highlights .
  
  You can see the result of the highlights on the nose cone of my movistar car:
  
  
• Car body lines and screws (Top of this page)
  
  These lines improve a lot the look of your car and make it more realistic.
  These lines are the lines that split the different parts of the car, so take in mind the different parts of the car.
  
  To create this lines first create a new layer for dark body-lines and screws. We will create the lines in color black.
  These lines have 2 pixel width (anti-aliased), and the screws have about 5 pixels forming a cross (anti-aliased too). I've used anti-aliased to make the curves of the body-line smooth.
  The next image shows some dark body-lines:
  
  Now, create a new layer for light body-lines and screws, the lines will be white.
  These lines have 1 pixel width (anti-aliased), and the screws have about 5 pixels forming a cross (anti-aliased too). I've used anti-aliased to make the curves of the body-line smooth.
  And you have to make these lines in the inner or the outter part with respect to the dark body-lines and screws created in the previous step.
  
  Finally we have adjust the opacity and the brightness of the two layers (dark body-lines and screwslight / body-lines and screws).
  The purpose of this step is to get a good 3D efect on our texture.
  Making some fine adjustments the result is:
  
  

Logos (Top of this page)

In this section is explained how to add somo logos to our car.
To start we have to get some logos that we can found serching en google ( www.google.com ) or in a web page, where we can get lot of logos of all brands of the world: www.brandsoftheworld.com .

Now, we have to paste the logos over the template, but we must do it in a separate layer, is to say, in a different layer from the layer of the background color.

Another piece of advice is add some shading around the logos to make the logos alive and get and impactant and realistic look to our car.

The next images show the textures of my movistar f1 car, in these images you can see all the things saids previusly (they are self explanatory):















And you can see the result in the next images:

We need to paint the cockpit of our car in order to see the correct colours on the on-board camera in gp4.
It's easy to paint the cockpit if you get a template first of all. For example I will paint the Original Cockpit Template by Nico from gpxcarpainting. You can read the readme file of this template that explains how to use it.
First of all I have to tell you that the cockpit has one texture only (tex file): cp_myteam.tex .
So we only need to modify this file.

cockpit template

movistar cockpit

movistar cockpit, 3D view

To finish our work, add and alpha layer, invert the textures and save the textures in tga format(32 bits and RLE encoded (RLE encoded is optional, but is better because the tga have less size)): cp_myteam.tga
Make a back-up of your cars.wad
Create the tex files with TexResizer (cp_myteam.tex)and update your cars.wad with WadUpdater (Open Wadupdater, select the cp_myteam.tex and the cars.wad. Then click on UpdateWad and automatically the cp_myteam.tex will be updated in your cars.wad.

With TeamEditor you can change the name of the slot and this affects to the name of the carshape (car_myteam_car1_lod0.gp4 ...) and for the cockpit name (cp_myteam.tex). So you have to use the name of the slot name of your team (it's to say the same name as your carshape).

movistar cockpit in game

But you have to modify the files in the folder: GP4/cars, these tex files are:

• driver9_1.tex, driver9_2.tex
  
• driver10_1.tex, driver10_2.tex
  
• driver21_1.tex, driver21_2.tex
  

Let`s see an example of a helmet, the shape of the helmet is:

Like in the car, we now are going to paint the helmet using the template.
It's easiest to paint the helmet as the car. You can see it in the next tga files for the helmet (driverX_1.tex, driverX_2.tex):

driverX_1.tex

driverX_2.tex

Finally we can see the result of our work on the 3D view of ZModeler. The next image shows my helmet for the movistar F1 car:

Helmet for the movistar F1 car

To finish our work, add and alpha layer and save the textures in tga format(32 bits and RLE encoded (RLE encoded is optional, but is better because the tga have less size)): driverX_1.tga and driverX_2.tga.
Note that you have not to invert the textures. Moreover I have to tell you that invert the textures depends on the template and the .z3d file to see the helmet in ZModeler. In some templates and .z3d files you don't need to flip vetically the textures but in others not. So, don't worry about this, if the texutre is incorrect in gp4 (flip vertically), just flip vertically the textures and you will solve your problem.
Make a back-up of your cars.wad
Create the tex files with TexResizer (driverX_1.tex and driverX_2.tex)and update your cars.wad with WadUpdater (Open Wadupdater, select the driverX_1.tex and the cars.wad. Then click on UpdateWad and automatically the driverX_1.tex will be updated in your cars.wad. Do the same for the driverX_2.tex).

Helmet in game

Helmet in game

Helmet in game

Finally we will paint the pitcrew.
The textures for the pitcrew are located in the anim.wad. The tex files for the engineer are located in the folder \animationdata\qualifying\skins and the name of the tex files are engin_myteam.tex.
The tex files for the pitcrew are located in the folder \animationdata\race\skins and the name of the tex files are pitcrew_myteam.tex.

Now our work is modify these textures, but we will use the Pitcrews templates by MaxDownforce and ChaosF1 from gpxcarpainting.
The textures that we have to modify are:

Pitcrew template, file: pitcrew_myteam.tex

Engineers template, file: engin_myteam.tex

Finally painting the background of this template and adding some logos we have a good pitcrews and engineers for our F1 team:

Pitcrew template, file: pitcrew_myteam.tex

Engineers template, file: engin_myteam.tex

To finish our work, add and alpha layer and save the textures in tga format(256pixels X 256pixels) (32 bits and RLE encoded (RLE encoded is optional, but is better because the tga have less size)): pitcrew.tga and engin.tga.
Note that you have not to invert the textures. Make a back-up of your anim.wad
Create the tex files with TexResizer (pitcrew.tex and engin.tex)and update your anim.wad with WadUpdater (Open Wadupdater, select the pitcrew_myteam.tex and the anim.wad. Then click on UpdateWad and automatically the pitcrew_myteam.tex will be updated in your anim.wad. Do the same for the engin_myteam.tex).

Moreover, you have to use the original slot name for the pitcrew_myteam.tex and engin_myteam.tex, its to say if your team is in the slot 11 you have to use the prost name for myteam.
I have tell you this because with TeamEditor you can change the name of the slot and this affects to the name of the carshape (car_myteam_car1_lod0.gp4 ...) and for the cockpit name (cp_myteam.tex). And the name of the helmets and the pitcrew aren't changed. So you must use the original team names for the pitcrews and engineers and original numbers for the helmets.

The original slots names are:

Pitcrew in game

Pitcrew in game

Pitcrew in game

Engineers in game

Engineers in game