[ADD] Fiber Stipples now use a color threshold to emphazise also low probabilities.

FiberStippleToolbox/src/fiberStipples/WMFiberStipples.cpp

@@ -99,6 +99,10 @@ void WMFiberStipples::properties()
     m_threshold->setMin( 0.0 );
     m_threshold->setMax( 1.0 );
 
+    m_colorThreshold = m_properties->addProperty( "Color Threshold", "Colors of connectivity scores below this threshold will be maped to colors representing this probability.", 0.00 );
+    m_colorThreshold->setMin( 0.0 );
+    m_colorThreshold->setMax( 1.0 );
+
     m_minRange = m_properties->addProperty( "Min Range", "Minimal stipple density", 0.0 );
     m_minRange->setMin( 0.0 );
     m_minRange->setMax( 1.0 );
@@ -247,6 +251,7 @@ void WMFiberStipples::initOSG( boost::shared_ptr< WDataSetScalar > probTract, co
     wge::bindAsUniform( m_output, numDensitySlices, "u_numDensitySlices" );
     wge::bindAsUniform( m_output, m_glyphSize, "u_glyphSize" );
     wge::bindAsUniform( m_output, m_glyphThickness, "u_glyphThickness" );
+    wge::bindAsUniform( m_output, m_colorThreshold, "u_colorThreshold" );
 
 
     // each slice (containing scattered quads) is child of an transformation node

FiberStippleToolbox/src/fiberStipples/WMFiberStipples.h

@@ -140,6 +140,11 @@ private:
      */
     WPropDouble m_threshold;
 
+    /**
+     * All probabilities below this probability are highlighted to the color of this probability.
+     */
+    WPropDouble m_colorThreshold;
+
     /**
      * Determines the size of the quad used to stamp out the stipples.
      */

FiberStippleToolbox/src/fiberStipples/shaders/WFiberStipples-fragment.glsl

@@ -42,6 +42,11 @@ uniform vec3 middlePoint_tex = vec3( 0.5, 0.5, 0.0 );
  */
 uniform float u_glyphThickness;
 
+/**
+ * All probabilities below this probability are highlighted to the color of this probability.
+ */
+uniform float u_colorThreshold;
+
 void main()
 {
     // generally the area of a line stipple is a circle with radius R (each half for the endings of the line stipple) plus
@@ -85,7 +90,8 @@ void main()
 
     if( distancePointLineSegment( gl_TexCoord[1].xyz, scaledFocalPoint1, scaledFocalPoint2 ) < radius )
     {
-        gl_FragColor = u_color * probability;
+        gl_FragColor = u_color * pow( probability, 1.0 / (10.0 * u_colorThreshold) );
+//        gl_FragColor = clamp( u_color * clamp( u_colorThreshold + probability, 0.0, 1.0 ) - vec4( 0.0, 0.0, 0.0, 0.2 ), 0.0, 1.0 );
     }
     else
     {