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Howto:Aircraft reflection shader: Difference between revisions
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[[ | [[File:B29 shader.jpg|thumb|270px|Reflection Shader applied to the [[Boeing B-29 Superfortress|B-29]]. It shows a shiny, high-reflective blank metal.]] | ||
Within [[Flightgear]] GIT and later, a reflection [[Shaders|shader]] effect is available. Only few aircraft make already use of it, but much more will be expected soon. | Within [[Flightgear]] GIT and later, a reflection [[Shaders|shader]] effect is available. Only few aircraft make already use of it, but much more will be expected soon. | ||
==Reflection-Shader and Reflect-Bump-Spec-Shader== | == Reflection-Shader and Reflect-Bump-Spec-Shader == | ||
We have currently two different Reflection-Shaders. A simple ReflectionShader which works also on not-UVmapped surfaces and a ReflectionShader including [http://wiki.flightgear.org/index.php/Howto:_Use_the_normal_map_effect_in_aircraft Normalmap]. The later one only works on UVmapped surfaces. | We have currently two different Reflection-Shaders. A simple ReflectionShader which works also on not-UVmapped surfaces and a ReflectionShader including [http://wiki.flightgear.org/index.php/Howto:_Use_the_normal_map_effect_in_aircraft Normalmap]. The later one only works on UVmapped surfaces. | ||
The first one is ideal for windows and even surfaces, the second one for bumpy surfaces. | The first one is ideal for windows and even surfaces, the second one for bumpy surfaces. | ||
This effect uses Cubemaps and Cubecrosses from data/Aircraft/Generic/Effects which contains the image of the environment which will be visible as Reflection. Depending on which you choose, the appearance of the model will later change dramatically. | This effect uses Cubemaps and Cubecrosses from data/Aircraft/Generic/Effects which contains the image of the environment which will be visible as Reflection. Depending on which you choose, the appearance of the model will later change dramatically. | ||
==How to implement== | == How to implement == | ||
===the simple and quick Method=== | === the simple and quick Method === | ||
This is a simple and quick method for the simple ReflectionShader, but gives not the freedom to change the later appearance of the aircraft like setting the strength of the reflection or choosing a different cubemap. | This is a simple and quick method for the simple ReflectionShader, but gives not the freedom to change the later appearance of the aircraft like setting the strength of the reflection or choosing a different cubemap. | ||
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As an example the C160 Transall by helijah makes use of this simple method. | As an example the C160 Transall by helijah makes use of this simple method. | ||
===a bit more difficult Method- but more freedom!=== | === a bit more difficult Method- but more freedom! === | ||
The next method describes how to add the effect of a customized simple ReflectionShader, which allows more freedom. | The next method describes how to add the effect of a customized simple ReflectionShader, which allows more freedom. | ||
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* <ambient_correction> = correct the appearance of the reflection at shadowed parts. | * <ambient_correction> = correct the appearance of the reflection at shadowed parts. | ||
* <reflect_map> = enables the use of a greymap. If enabled the greymap will controll the strength of the reflection. Black = zero reflection, White = full reflection. For modern aircraft coatings a grey of 75-90% is usefull, for chromish parts about 10-25%. | * <reflect_map> = enables the use of a greymap. If enabled the greymap will controll the strength of the reflection. Black = zero reflection, White = full reflection. For modern aircraft coatings a grey of 75-90% is usefull, for chromish parts about 10-25%. | ||
* <refl_correction> = another parameter for controlling the strength of the reflection. Reflect_map and refl_correction are working together. | * <refl_correction> = another parameter for controlling the strength of the reflection. Reflect_map and refl_correction are working together. | ||
* ''"texture= n5"'' is the path to the image wich will be later the reflection. You can choose between cubemaps with 6 single images or a cubecross. You can take the one included in ''data/Aircraft/Generic/Effects'' or you can use your own. | * ''"texture= n5"'' is the path to the image wich will be later the reflection. You can choose between cubemaps with 6 single images or a cubecross. You can take the one included in ''data/Aircraft/Generic/Effects'' or you can use your own. | ||
* ''"texture= n6"'' is the path to the rainbow-texture. | * ''"texture= n6"'' is the path to the rainbow-texture. | ||