Hi Martin,
Here you could implement a custom osgFX::Effect. Have a look to
osgFX::Cartoon : it is a simple effect with two pass.
Martin Großer a écrit :
Hello,
I have the following vertex and fragment shader. This is a simply fur shader,
but the difficult part is the rendering in passes.
Vertex Shader
--------------
uniform float shell_distance; // is a constant
uniform float pass_index; // increase on every render pass
varying vec2 vTexCoord;
void main(void)
{
vTexCoord = gl_MultiTexCoord0.xy;
vec4 Position = gl_Vertex;
Position.xyz += shell_distance * pass_index * gl_Normal;
gl_Position = gl_ModelViewProjectionMatrix * Position;
}
Fragment Shader
----------------
uniform vec4 furColorScale;
uniform sampler2D Fur;
uniform sampler2D FurColor;
varying vec2 vTexCoord;
void main(void)
{
// Get the alpha component for this shaft
vec4 fAlpha = texture2D( Fur, vTexCoord );
// Get the hair shaft color, and scale by the color scale
vec4 fColor = furColorScale * texture2D( FurColor, vTexCoord )*fAlpha;
// Return the calculated color
gl_FragColor = fColor;
}
My problem is, how can render a object in some passes??
My idea is... - first I render the Objekt with Shader -> pass_index = 1
- second I increase the pass_index -> pass_index = 2
- than the first and the second step again and so on
- at the end I want to see the combined scene
How can I implement this with OpenSceneGraph?
Cheers,
Martin
--
Lamoliatte Stephane
Ingenieur R&D
R.S.A. Cosmos
Z.I. de la Vaure - B.P.40
42290 Sorbiers, France
Tél : +33 (0)4 77 53 30 48
Fax : +33 (0)4 77 53 38 61
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