fix translucency model using new permittance setting

plugins/ImageReader/ConfigUI.qml

@@ -165,6 +165,29 @@ UM.Dialog
             }
         }
 
+        UM.TooltipArea {
+            Layout.fillWidth:true
+            height: childrenRect.height
+            text: catalog.i18nc("@info:tooltip","The percentage of light penetrating a print with a thickness of 1 millimeter.")
+            Row {
+                width: parent.width
+
+                Label {
+                    text: catalog.i18nc("@action:label", "1mm Transmittance (%)")
+                    width: 150 * screenScaleFactor
+                    anchors.verticalCenter: parent.verticalCenter
+                }
+                TextField {
+                    id: transmittance
+                    objectName: "Transmittance"
+                    focus: true
+                    validator: RegExpValidator {regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/}
+                    width: 180 * screenScaleFactor
+                    onTextChanged: { manager.onTransmittanceChanged(text) }
+                }
+            }
+        }
+
         UM.TooltipArea {
             Layout.fillWidth:true
             height: childrenRect.height

plugins/ImageReader/ImageReader.py

@@ -48,9 +48,9 @@ class ImageReader(MeshReader):
 
     def _read(self, file_name):
         size = max(self._ui.getWidth(), self._ui.getDepth())
-        return self._generateSceneNode(file_name, size, self._ui.peak_height, self._ui.base_height, self._ui.smoothing, 512, self._ui.lighter_is_higher, self._ui.use_logarithmic_function)
+        return self._generateSceneNode(file_name, size, self._ui.peak_height, self._ui.base_height, self._ui.smoothing, 512, self._ui.lighter_is_higher, self._ui.use_logarithmic_function, self._ui.transmittance_1mm)
 
-    def _generateSceneNode(self, file_name, xz_size, peak_height, base_height, blur_iterations, max_size, lighter_is_higher, use_logarithmic_function):
+    def _generateSceneNode(self, file_name, xz_size, peak_height, base_height, blur_iterations, max_size, lighter_is_higher, use_logarithmic_function, transmittance_1mm):
         scene_node = SceneNode()
 
         mesh = MeshBuilder()
@@ -127,10 +127,11 @@ class ImageReader(MeshReader):
             Job.yieldThread()
 
         if use_logarithmic_function:
-            min_luminance = 2.0 ** (peak_height - base_height)
+            p = 1.0 / math.log(transmittance_1mm / 100.0, 2)
+            min_luminance = 2.0 ** ((peak_height - base_height) / p)
             for (y, x) in numpy.ndindex(height_data.shape):
                 mapped_luminance = min_luminance + (1.0 - min_luminance) * height_data[y, x]
-                height_data[y, x] = peak_height - math.log(mapped_luminance, 2)
+                height_data[y, x] = peak_height - p * math.log(mapped_luminance, 2)
         else:
             height_data *= scale_vector.y
             height_data += base_height

plugins/ImageReader/ImageReaderUI.py

@@ -35,6 +35,7 @@ class ImageReaderUI(QObject):
         self.smoothing = 1
         self.lighter_is_higher = False;
         self.use_logarithmic_function = False;
+        self.transmittance_1mm = 40.0;
 
         self._ui_lock = threading.Lock()
         self._cancelled = False
@@ -76,6 +77,7 @@ class ImageReaderUI(QObject):
 
         self._ui_view.findChild(QObject, "Base_Height").setProperty("text", str(self.base_height))
         self._ui_view.findChild(QObject, "Peak_Height").setProperty("text", str(self.peak_height))
+        self._ui_view.findChild(QObject, "Transmittance").setProperty("text", str(self.transmittance_1mm))
         self._ui_view.findChild(QObject, "Smoothing").setProperty("value", self.smoothing)
 
     def _createConfigUI(self):
@@ -150,3 +152,6 @@ class ImageReaderUI(QObject):
     def onConvertFunctionChanged(self, value):
         self.use_logarithmic_function = (value == 0)
 
+    @pyqtSlot(int)
+    def onTransmittanceChanged(self, value):
+        self.transmittance_1mm = value