Hi,
The idea is to capture the mouse picking in the model and paint on. We can see
a red circle in the model and the result of RTT in the quad. I guess it will
catch part of the models arm..
[Image: http://img844.imageshack.us/img844/9583/kokkp.jpg ]
Whith these shaders I can paint red circles:
Vertex Shader
Code:
varying vec2 Texcoord;
varying vec3 ViewDirection;
varying vec3 LightDirection;
varying vec3 Normal;
varying vec4 color;
varying vec3 position;
void main( void )
{
gl_Position = ftransform();
Texcoord = gl_MultiTexCoord0.xy;
position = gl_Vertex.xyz;
vec4 fvObjectPosition = gl_ModelViewMatrix * gl_Vertex;
ViewDirection = normalize(- fvObjectPosition.xyz);
LightDirection = normalize(gl_LightSource[0].position.xyz -
fvObjectPosition.xyz);
Normal = normalize(gl_NormalMatrix * gl_Normal);
float fNDotL = dot( Normal, LightDirection );
float NdotL = max(dot(Normal, LightDirection), 0.0);
vec4 diffuse = NdotL * gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
vec4 ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;
vec4 globalAmbient = gl_LightModel.ambient * gl_FrontMaterial.ambient;
vec3 fvReflection = normalize( ( ( 2.0 * Normal ) * fNDotL ) -
LightDirection );
vec3 fvViewDirection = normalize( ViewDirection );
float fRDotV = max( 0.0, dot( fvReflection, fvViewDirection ) );
vec4 specular = gl_FrontMaterial.specular * gl_LightSource[0].specular *
pow(fRDotV,200.0);
color = diffuse + globalAmbient + ambient + specular;
}
Fragment Shader
Code:
uniform vec2 textCoord;
uniform sampler2D baseMap;
uniform vec3 interPos;
varying vec3 Normal;
varying vec4 color;
varying vec2 Texcoord;
varying vec3 position;
void main( void )
{
float radio = 3.0;
vec3 a = position - interPos;
float dist = sqrt((a.x*a.x)+(a.y*a.y)+(a.z*a.z));
vec4 paintColor = vec4(1.0,0.0,0.0,1.0);
vec4 col = texture2D( baseMap, Texcoord ) * color;
if(dist<radio){
gl_FragData[0] = texture2D( baseMap, Texcoord ) * color + paintColor;
gl_FragData[1] = paintColor;
}
else{
gl_FragData[0] = texture2D( baseMap, Texcoord ) * color;
gl_FragData[1] = vec4(1.0,1.0,1.0,1.0);
}
}
The question is, is there any way to store gl_FragData [1] data to get an
image like texture model and save it in the aplication?
Thank you!
Cheers,
Aitor
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=32736#32736
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