Hey everyone! 
As some of you may realize, I made my first model in Blender [1].
For that, after installing and configuring it, I created a sphere:
Figur1 1. Blender - Sphere.
After that, I selected all the vertexes (by pressing A - I have used this a lot!).
Figure 2. Blender - Selecting all vertexes.
After that, I selected the top vertex, activated the Proportional Editing [2] and pressed the keys G then Z, that allowed me to stretch the top of the sphere.
Figure 3. Blender - Proportional Editing.
As the edges were a bit rought, I took care of the smoothing [3].
Figure 4. Blender - Smoothing.
And the model ended up like this:
Figure 5. Blender - Model after the smoothing.
With the 3D model built, it was time for the UV mapping [4], by simply accessing the UV Editing menu.
Figure 6. Blender - UV Mapping.
Then, I started editing the UV map (with the Tab on the right image on can access the edition mode, that allows us to see all of the vertexes).
Then I just selected the edges where I wanted to curt the object in order to create a 2D image that will be used for the texture. Then, mark seam [5].
Figure 7. Blender - UV Mapping - Mark Seams.
It is ready to be unwrapped (select all - A - then U and press "Unwrap" on the menu that appears):
Figure 8. Blender - Unwrap.
With the UV map, I just had to export it (in the format .obj) and change the platform for the texture..
For the first usage, Blender is not that intuitive, as it has lots of features and menus. However, as almost everything, the more time one invests, the easier it gets. I strongly recommend this 3D platform, as apart from being quite robust, it is open source.
For the texture I have used Substance Painter [6] (they have free licenses for education [7]).
When I imported the model, the platform seemed relativelyt easy to use:
Figure 9. Substance Painter - Model imported.
I started by changing the material:
Figure 10. Substance Painter - Material.
Then the Base Color:
Figure 11. Substance Painter - Base color.
And ended up with this final result:
Figure 12. Substance Painter - Final Result.
With the model and the texture created, I just had to export on a format that I wanted and import in Unity.
If you want to look at a scene that I created with the model, check this FPS [8] (for more information on this FPS, check this thread in BabelX3D [9]).
Figur3 13. 3D Model imported in Unity.
Best regards,
References
[1] Blender (2019). Disponível online em: https://www.blender.org/ (acedido em: 25 de novembro de 2019).
[2] Blender 2.79 Manual (sd). Proportional Edit. Disponível online em:
https://docs.blender.org/manual/en/2.79/editors/3dview/object/editing/tr...(acedido em: 25 de novembro de 2019).
[3] Blender 2.77 Manual (sd). Smoothing. Disponível online em: https://easyblend.org/html/modeling/meshes/smoothing.html (acedido em: 25 de novembro de 2019).
[4] Blender 3D: Noob to Pro/UV Map Basics (2019). Disponível online em: https://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro/UV_Map_Basics (acedido em: 25 de novembro de 2019).
[5] Blender 2.81 Manual (sd). Seams. Disponível online em: https://docs.blender.org/manual/en/latest/modeling/meshes/editing/uv/unwrapping/seams.html (acedido em: 25 de novembro de 2019).
[6] Substance Painter (2019). Disponível online em: https://www.substance3d.com/products/substance-painter/ (acedido em: 25 de novembro de 2019).
[7] Substance Painter (2019). Special Offers for Education. Disponível online em: https://www.substance3d.com/education/ (acedido em: 25 de novembro de 2019).
[8] Peres, G. (2019). First Game. Disponível online em: http://xr4.goncaloperes.com/ (acedido em: 27 de novembro de 2019).
[9] Peres, G. (2019). My first FPS, Model in Blender and some Experiences. Disponível online em: https://portal.babelx3d.net/content/my-first-fps-model-blender-and-some-experiences (acedido em: 27 de novembro de 2019).