update VR helper

Author: NicolasRannou

src/helpers/helpers.slice.js

@@ -337,6 +337,8 @@ export default class HelpersSlice extends HelpersMaterialMixin( THREE.Object3D )
 
   updateIntensitySettingsUniforms() {
 
+    // compensate for the offset to only pass > 0 values to shaders
+    // models > models.stack.js : _packTo8Bits
     let offset = 0;
     if( this._stack._minMax[0] < 0 ){
 

src/helpers/helpers.volumerendering.js

@@ -50,6 +50,15 @@ export default class HelpersVolumeRendering extends HelpersMaterialMixin( THREE.
 
   _prepareMaterial(){
 
+    // compensate for the offset to only pass > 0 values to shaders
+    // models > models.stack.js : _packTo8Bits
+    let offset = 0;
+    if( this._stack._minMax[0] < 0 ){
+
+      offset = this._stack._minMax[0];
+
+    }
+
     // uniforms
     this._uniforms = ShadersUniform.uniforms();
     this._uniforms.uWorldBBox.value = this._stack.worldBoundingBox();
@@ -60,7 +69,7 @@ export default class HelpersVolumeRendering extends HelpersMaterialMixin( THREE.
     this._uniforms.uPixelType.value = this._stack.pixelType;
     this._uniforms.uBitsAllocated.value = this._stack.bitsAllocated;
     this._uniforms.uPackedPerPixel.value = this._stack.packedPerPixel;
-    this._uniforms.uWindowCenterWidth.value = [this._stack.windowCenter, this._stack.windowWidth * 0.8];
+    this._uniforms.uWindowCenterWidth.value = [offset + this._stack.windowCenter, this._stack.windowWidth * 0.8];
     this._uniforms.uRescaleSlopeIntercept.value = [this._stack.rescaleSlope, this._stack.rescaleIntercept];
     this._uniforms.uDataDimensions.value = [this._stack.dimensionsIJK.x,
                                                 this._stack.dimensionsIJK.y,

src/models/models.stack.js

@@ -507,7 +507,6 @@ export default class ModelsStack extends ModelsBase{
       }
       packed.textureType = THREE.LuminanceFormat;
       packed.data = data;
-      console.log( data );
 
     } else if (bits === 16 && channels === 1) {