Rajout d'une méthode pour la normalisation de l'attenuation de couleurs.

Apps/Examples/clipping.cpp

@@ -84,6 +84,7 @@ void Clipping::slot_pushButton_addPlane()
 	// Set params
 	m_shader->setClipPlaneParamsOrigin(newPlaneId, m_bb.center());
 	pickable->translate(m_bb.center());
+	pickable->scale(Geom::Vec3f(m_bb.maxSize()*0.5));
 
 	// Update shader sources edits
 	dock.vertexEdit->setPlainText(QString(m_shader->getVertexShaderSrc()));
@@ -120,9 +121,9 @@ void Clipping::slot_pushButton_addSphere()
 
 	// Set params
 	m_shader->setClipSphereParamsCenter(newSphereId, m_bb.center());
-	m_shader->setClipSphereParamsRadius(newSphereId, (m_bb.maxSize())*1.0);
+	m_shader->setClipSphereParamsRadius(newSphereId, (m_bb.maxSize())*0.5);
 	pickable->translate(m_bb.center());
-	pickable->scale(Geom::Vec3f(m_bb.maxSize()*1.0));
+	pickable->scale(Geom::Vec3f(m_bb.maxSize()*0.5));
 
 	// Update shader sources edits
 	dock.vertexEdit->setPlainText(QString(m_shader->getVertexShaderSrc()));
@@ -152,7 +153,7 @@ void Clipping::slot_pushButton_changeSpheresColor()
 
 void Clipping::slot_doubleSpinBox_ColorAttenuationFactor(double c)
 {
-	m_shader->setClipColorAttenuationFactor((float)c);
+	m_shader->setClipColorAttenuationFactorAbsolute((float)c);
 	updateGL();
 }
 
@@ -374,6 +375,8 @@ void Clipping::importMesh(std::string& filename)
 	setParamObject(gWidthObj, gPosObj.data()) ;
 
 	updateGLMatrices();
+
+	m_shader->setClipColorAttenuationFactorRelative(m_bb.maxSize(), 5.0);
 }
 
 /*******************************************************************************

Apps/Examples/clipping.ui

@@ -302,6 +302,9 @@
                </item>
                <item>
                 <widget class="QDoubleSpinBox" name="doubleSpinBox_ColorAttenuationFactor">
+                 <property name="decimals">
+                  <number>4</number>
+                 </property>
                  <property name="singleStep">
                   <double>1.000000000000000</double>
                  </property>

include/Utils/clippingShader.h

@@ -272,7 +272,14 @@ public:
 	 * sets the color attenuation factor
 	 * @param colorAttenuationFactor color attenuation factor
 	 */
-	void setClipColorAttenuationFactor(float colorAttenuationFactor);
+	void setClipColorAttenuationFactorAbsolute(float colorAttenuationFactor);
+
+	/**
+	 * sets the color attenuation factor according to an object size
+	 * @param size size with which the color attenuation will be normalized
+	 * @param factor attenuation factor
+	 */
+	void setClipColorAttenuationFactorRelative(float size, float factor);
 
 	/// gets the color attenuation factor
 	float getClipColorAttenuationFactor();

src/Utils/clippingShader.cpp

@@ -814,7 +814,7 @@ bool ClippingShader::insertClippingCode()
 	return true;
 }
 
-void ClippingShader::setClipColorAttenuationFactor(float colorAttenuationFactor)
+void ClippingShader::setClipColorAttenuationFactorAbsolute(float colorAttenuationFactor)
 {
 	// Check if it is worth updating values !
 	if (colorAttenuationFactor == m_clipColorAttenuationFactor)
@@ -827,6 +827,19 @@ void ClippingShader::setClipColorAttenuationFactor(float colorAttenuationFactor)
 	sendClipColorAttenuationFactorUniform();
 }
 
+void ClippingShader::setClipColorAttenuationFactorRelative(float size, float factor)
+{
+	// Compute the relative color attenuation factor
+	float colAttFact;
+	if (size != 0.0)
+		colAttFact = factor / size;
+	else
+		colAttFact = factor;
+
+	// Set the resulting factor in absolute
+	setClipColorAttenuationFactorAbsolute(colAttFact);
+}
+
 float ClippingShader::getClipColorAttenuationFactor()
 {
 	return m_clipColorAttenuationFactor;