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dellepiane: modified shader to avoid projection on the back of a camera

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Matteo Dellepiane matteodelle 2012-05-09 15:00:15 +00:00
parent 162be7f6b7
commit aabafe2cad
1 changed files with 4 additions and 1 deletions
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5
src/meshlabplugins/filter_img_patch_param/VisibilityCheck.cpp
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@ -389,6 +389,7 @@ bool VisibilityCheck_ShadowMap::initShaders()
uniform sampler2DShadow u_SadowMap;
uniform mat4 u_ShadowProj;
uniform vec3 u_Viewpoint;
uniform vec3 u_ZAxis;
const float V_UNDEFINED = 0.0;
const float V_BACKFACE = 1.0 / 255.0;
@ -400,7 +401,7 @@ bool VisibilityCheck_ShadowMap::initShaders()
vec3 pos = texelFetch( u_VertexMap, ivec2(gl_FragCoord.xy), 0 ).xyz;
vec3 nor = texelFetch( u_NormalMap, ivec2(gl_FragCoord.xy), 0 ).xyz;
if( dot(u_Viewpoint-pos,nor) < 0.0 )
if( dot(u_Viewpoint-pos,nor) < 0.0 || dot(u_Viewpoint-pos,-u_ZAxis) > 0.0 )
gl_FragColor = vec4( V_BACKFACE );
else
{
@ -544,6 +545,8 @@ void VisibilityCheck_ShadowMap::checkVisibility()
boundShader->setUniform( "u_SadowMap" , 2 );
boundShader->setUniform4x4( "u_ShadowProj", m_ShadowProj.V(), false );
boundShader->setUniform3( "u_Viewpoint", m_Raster->shot.GetViewPoint().V() );
boundShader->setUniform3( "u_ZAxis", m_Raster->shot.Axis(2).V() );
glBegin( GL_QUADS );
glVertex2i( -1, -1 );