FGFS-4.1/OpenSceneGraph
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Updates to the light points support to improve the control of the blending of

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light points with their background.
This commit is contained in:
Robert Osfield
2002-12-10 19:56:14 +00:00
parent c259cadd6d
commit 97a4775b7e
6 changed files with 240 additions and 68 deletions
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17
src/osgSim/LightPointNode.cpp
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@@ -7,7 +7,8 @@
// for further information contact robert@openscenegraph.com.
#include <osgSim/LightPointNode>
#include <osgSim/LightPointDrawable>
#include "LightPointDrawable.h"
#include <osg/Timer>
#include <osg/BoundingBox>
@@ -260,6 +261,7 @@ void LightPointNode::traverse(osg::NodeVisitor& nv)
// adjust pixel size to account for intensity.
if (intensity!=1.0) pixelSize *= sqrt(intensity);
osg::Vec3 xpos(position*matrix);
if (pixelSize<1.0f)
{
// need to use alpha blending...
@@ -268,7 +270,7 @@ void LightPointNode::traverse(osg::NodeVisitor& nv)
if (color[3]<=minimumIntensity) continue;
drawable->addLightPoint(0, position*matrix,color);
drawable->addBlendedLightPoint(0, xpos,color);
}
else if (pixelSize<lp._maxPixelSize)
{
@@ -276,18 +278,17 @@ void LightPointNode::traverse(osg::NodeVisitor& nv)
unsigned int lowerBoundPixelSize = (unsigned int)pixelSize;
//float remainder = pixelSize-(float)lowerBoundPixelSize;
float remainder = osg::square(pixelSize-(float)lowerBoundPixelSize);
osg::Vec3 xpos = position*matrix;
float alpha = color[3];
color[3] = alpha*(1.0f-remainder);
drawable->addLightPoint(lowerBoundPixelSize-1, xpos,color);
// color[3] = alpha*(1.0f-remainder);
drawable->addBlendedLightPoint(lowerBoundPixelSize-1, xpos,color);
//color[3] = osg::square(remainder);
// //color[3] = osg::square(remainder);
color[3] = alpha*remainder;
drawable->addLightPoint(lowerBoundPixelSize, xpos,color);
drawable->addBlendedLightPoint(lowerBoundPixelSize, xpos,color);
}
else // use a billboard geometry.
{
drawable->addLightPoint((unsigned int)(lp._maxPixelSize-1.0), position*matrix,color);
drawable->addOpaqueLightPoint((unsigned int)(lp._maxPixelSize-1.0), xpos,color);
}
}