[ADD] - added option to show complete slices

src/graphicsEngine/shaders/shaders/WGEColormapping-fragment.glsl

@@ -57,7 +57,6 @@ void colormap( inout vec4 color, in sampler3D sampler, in vec3 coord, float minV
     // compositing:
     // associated colors needed
     src.rgb *= src.a;
-    //src.a = 1.0;
     // apply front-to-back compositing
     color = ( 1.0 - color.a ) * src + color;
 }

src/modules/navigationSlices/WMNavigationSlices.cpp

@@ -31,6 +31,7 @@
 #include "../../graphicsEngine/WGEGeodeUtils.h"
 #include "../../graphicsEngine/callbacks/WGELinearTranslationCallback.h"
 #include "../../graphicsEngine/callbacks/WGENodeMaskCallback.h"
+#include "../../graphicsEngine/callbacks/WGEPropertyUniformCallback.h"
 #include "../../graphicsEngine/callbacks/WGEShaderAnimationCallback.h"
 #include "../../graphicsEngine/shaders/WGEPropertyUniform.h"
 #include "../../graphicsEngine/shaders/WGEShader.h"
@@ -85,6 +86,9 @@ void WMNavigationSlices::connectors()
 
 void WMNavigationSlices::properties()
 {
+    m_noTransparency  = m_properties->addProperty( "No Transparency", "If checked, transparency is not used. This will show the complete slices.",
+                                                   false );
+
     m_sliceGroup      = m_properties->addPropertyGroup( "Slices",  "Slice Options." );
 
     // enable slices
@@ -222,6 +226,11 @@ void WMNavigationSlices::initOSG()
     state->addUniform( animationUniform );
     animationUniform->setUpdateCallback( new WGEShaderAnimationCallback() );
 
+    // transparency property
+    osg::ref_ptr< osg::Uniform > transparencyUniform = new osg::Uniform( "u_noTransparency", false );
+    state->addUniform( transparencyUniform );
+    transparencyUniform->setUpdateCallback( new WGEPropertyUniformCallback< WPropBool >( m_noTransparency ) );
+
     // add the transformation nodes to the output group
     m_output->insert( mX );
     m_output->insert( mY );

src/modules/navigationSlices/WMNavigationSlices.h

@@ -196,6 +196,8 @@ private:
      */
     osg::ref_ptr< WGEManagedGroupNode > m_output;
 
+    WPropBool    m_noTransparency;  //!< if true, the whole slices are shown.
+
     WPropGroup    m_sliceGroup; //!< the group contains several slice properties
 
     WPropDouble    m_xPos; //!< x position of the slice

src/modules/navigationSlices/shaders/WMNavigationSlices-fragment.glsl

@@ -35,6 +35,9 @@ uniform float u_picked;
 // animation time. Used for pick-animation
 uniform int u_timer;
 
+// if true, no transparency should be used.
+uniform bool u_noTransparency;
+
 /**
  * Applies colormapping.
  */
@@ -47,9 +50,18 @@ void main()
     // NOTE: the 100.0 depends on the timer tick. We have a timer that counts one per a hundreth of a second.
     float pickColorIntensity = 0.5 * ( 1.0 + sin( 3.0 * 3.1472 * float( u_timer ) / 100.0 ) );
     // as we use this for blending, we want it to swing in [0.5-0.75]
-    pickColorIntensity = 0.5 + ( pickColorIntensity * 0.25 );
+    pickColorIntensity = ( pickColorIntensity * 0.25 ) + 0.5;
+
+    // remove transparency?
+    float removeTransparency = clamp( u_picked + float( u_noTransparency ), 0.0, 1.0 );
+    cmap.a = ( ( 1.0 - removeTransparency ) * cmap.a ) + removeTransparency;
 
     // mix colormapping and pick color
-    gl_FragColor = mix( pickColor, cmap, ( ( 1.0 - u_picked ) * 1.0 ) + ( u_picked * pickColorIntensity ) );
+    vec4 finalColor = mix( pickColor, cmap,
+                           ( 1.0 - u_picked ) + ( u_picked * pickColorIntensity ) // mix intensity. This is influenced by the pick-state.
+                         );
+
+    // set as fragColor and remove transparency if needed.
+    gl_FragColor = vec4( finalColor.rgba );
 }