2,732
edits
Howto:Use the normal map effect in aircraft: Difference between revisions
Jump to navigation
Jump to search
m
Howto:Use the normal map effect in aircraft (view source)
Revision as of 09:56, 25 October 2015
, 25 October 2015typo, add templates
m (Robot: Cosmetic changes) |
Red Leader (talk | contribs) m (typo, add templates) |
||
| (5 intermediate revisions by 3 users not shown) | |||
| Line 1: | Line 1: | ||
{{caution| | |||
The [[model-combined effect]] shader has '''replaced''' the separate normal map effect shader. | |||
The separate normal map effect shader should be considered '''deprecated''' and '''should not be used for new development'''.}} | |||
[[FlightGear]] 2.0.0 introduced effects, a powerful way to use shaders within FG without having to write C code. As of March 2010, [[FlightGear Git]] has a normal map effect (Effects/bumpspec.eff), which provides both bump mapping and specular mapping. This [[:Category:Howto|howto]] provides a tutorial on using this effect for [[aircraft]]. Similar techniques can be used to use other effects on aircraft. | [[FlightGear]] 2.0.0 introduced effects, a powerful way to use shaders within FG without having to write C code. As of March 2010, [[FlightGear Git]] has a normal map effect (Effects/bumpspec.eff), which provides both bump mapping and specular mapping. This [[:Category:Howto|howto]] provides a tutorial on using this effect for [[aircraft]]. Similar techniques can be used to use other effects on aircraft. | ||
If you don't know how a normal map works, have a look | If you don't know how a normal map works, have a look {{wikipedia|normal mapping|here|noicon=1}}. | ||
The latest documentation on the FlightGear effects system is to be found in | The latest documentation on the FlightGear effects system is to be found in {{readme file|effects}}. | ||
== Creating the normal map == | == Creating the normal map == | ||
To create the normal map, there are two options. | To create the normal map, there are two options. | ||
* We can use a plugin that can convert a 2D texture representing height to a set of normals. There is a good [http://registry.gimp.org/node/69 normalmap plugin] for [[GIMP]] available. Those on Ubuntu should be able to install it directly from the package manager. | * We can use a plugin that can convert a 2D texture representing height to a set of normals. There is a good [http://registry.gimp.org/node/69 normalmap plugin] for [[GIMP]] available. Those on Ubuntu should be able to install it directly from the package manager. | ||
* On the other hand, we can create a high polygon density model of the object in a 3D editor, and generate the normal map from this model. You can find more | * On the other hand, we can create a high polygon density model of the object in a 3D editor, and generate the normal map from this model. You can find more information on this approach , applied to blender, [http://wiki.blender.org/index.php/Doc:Manual/Textures/Maps/Bump_and_Normal_Maps here] | ||
=== Lets see the 2D approach first: === | === Lets see the 2D approach first: === | ||
| Line 98: | Line 103: | ||
* If you find that the effect is too pronounced, try varying the scaling in the normalmap filter. 0.1 seems to work well for "rivet" effects. | * If you find that the effect is too pronounced, try varying the scaling in the normalmap filter. 0.1 seems to work well for "rivet" effects. | ||
* Make sure all the faces of the object that you assign the effect to have a texture assigned to them, otherwise you will cause a crash in the [[OpenGL]] layer (below [[OSG]]), because the effect's tangent and binormal vectors are computed using object's texture mapping coordinates. If you try to feed an untextured object to the generator, it should abort with a null vector, and then passing this null vector to the driver leads to a segfault. | * Make sure all the faces of the object that you assign the effect to have a texture assigned to them, otherwise you will cause a crash in the [[OpenGL]] layer (below [[OSG]]), because the effect's tangent and binormal vectors are computed using object's texture mapping coordinates. If you try to feed an untextured object to the generator, it should abort with a null vector, and then passing this null vector to the driver leads to a segfault. | ||
[[Category:Aircraft enhancement]] | |||
[[Category:Shaders]] | |||
[[fr:Tutoriel: Usage de l'effet de Normal Maps]] | [[fr:Tutoriel: Usage de l'effet de Normal Maps]] | ||