Added TerrainNode::setColorFilter(layerNum,Filter) to allow developers to set

what type of texture filter to use, either LINEAER and NEAREST.

src/osgTerrain/GeometryTechnique.cpp

@@ -49,6 +49,7 @@ void GeometryTechnique::init()
     osgTerrain::Layer* elevationLayer = _terrainNode->getElevationLayer();
     osgTerrain::Layer* colorLayer = _terrainNode->getColorLayer(0);
     osg::TransferFunction* colorTF = _terrainNode->getColorTransferFunction(0);
+    osgTerrain::TerrainNode::Filter filter = _terrainNode->getColorFilter(0);
 
     // if the elevationLayer and colorLayer are the same, and there is colorTF then
     // simply assing as a texture coordinate.
@@ -286,6 +287,8 @@ void GeometryTechnique::init()
             texture2D->setResizeNonPowerOfTwoHint(false);
             stateset->setTextureAttributeAndModes(color_index, texture2D, osg::StateAttribute::ON);
 
+            texture2D->setFilter(osg::Texture::MAG_FILTER, filter==TerrainNode::LINEAR ? osg::Texture::LINEAR :  osg::Texture::NEAREST);
+
             if (tf)
             {
                 // up the precision of hte internal texture format to its maximum.

src/osgTerrain/TerrainNode.cpp

@@ -81,6 +81,13 @@ void TerrainNode::setColorTransferFunction(unsigned int i, osg::TransferFunction
     _colorLayers[i].transferFunction = tf;
 }
 
+void TerrainNode::setColorFilter(unsigned int i, Filter filter)
+{
+    if (_colorLayers.size() <= i) _colorLayers.resize(i+1);
+    
+    _colorLayers[i].filter = filter;
+}
+
 osg::BoundingSphere TerrainNode::computeBound() const
 {
     osg::BoundingSphere bs;