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Add fudge factor to move the water mesh away from camera when the camera gets too close

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This commit is contained in:
scrawl 2015-11-02 00:30:18 +01:00
parent 4690ec12cc
commit c60388afb6
1 changed files with 31 additions and 0 deletions
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31
apps/openmw/mwrender/water.cpp
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@ -205,6 +205,36 @@ public:
}
};
/// Moves water mesh away from the camera slightly if the camera gets to close on the Z axis.
/// The offset works around graphics artifacts that occured with the GL_DEPTH_CLAMP when the camera gets extremely close to the mesh (seen on NVIDIA at least).
/// Must be added as a Cull callback.
class FudgeCallback : public osg::NodeCallback
{
public:
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
osgUtil::CullVisitor* cv = static_cast<osgUtil::CullVisitor*>(nv);
const float fudge = 0.1;
if (std::abs(cv->getEyeLocal().z()) < fudge)
{
float diff = fudge - cv->getEyeLocal().z();
osg::RefMatrix* modelViewMatrix = new osg::RefMatrix(*cv->getModelViewMatrix());
if (cv->getEyeLocal().z() > 0)
modelViewMatrix->preMultTranslate(osg::Vec3f(0,0,-diff));
else
modelViewMatrix->preMultTranslate(osg::Vec3f(0,0,diff));
cv->pushModelViewMatrix(modelViewMatrix, osg::Transform::RELATIVE_RF);
traverse(node, nv);
cv->popModelViewMatrix();
}
else
traverse(node, nv);
}
};
osg::ref_ptr<osg::Shader> readShader (osg::Shader::Type type, const std::string& file, const std::map<std::string, std::string>& defineMap = std::map<std::string, std::string>())
{
osg::ref_ptr<osg::Shader> shader (new osg::Shader(type));
@ -432,6 +462,7 @@ Water::Water(osg::Group *parent, osg::Group* sceneRoot, Resource::ResourceSystem
mWaterNode = new osg::PositionAttitudeTransform;
mWaterNode->addChild(mWaterGeode);
mWaterNode->addCullCallback(new FudgeCallback);
// simple water fallback for the local map
osg::ref_ptr<osg::Geode> geode2 (osg::clone(mWaterGeode.get(), osg::CopyOp::DEEP_COPY_NODES));