fixed some zero bugs

src/main/java/bdv/jogl/VolumeRenderer/ShaderPrograms/MultiVolumeRenderer.java

@@ -558,8 +558,9 @@ public class MultiVolumeRenderer extends AbstractShaderSceneElement{
 			dim = new int[]{(int)data.memSize[0], 
 					(int)data.memSize[1], 
 					(int)data.memSize[2]};
+			if(buffer.capacity()>0){
 			volumeTextureMap.get(i).update(gl2, 0, buffer, dim);
-
+			}
 			if(getArrayEntryLocation(gl2,suvVoxelOffsets,i)!=-1){
 				int off[] = new int[]{
 						(int)data.memOffset[0],

src/main/java/bdv/jogl/VolumeRenderer/ShaderPrograms/ShaderSources/MultiVolumeRendererShaderSource.java

@@ -221,7 +221,7 @@ public class MultiVolumeRendererShaderSource extends AbstractShaderSource{
 				"",
 				"vec3 getCoordinateInVolumeSpace(vec3 positionOnRay, int volumeNumber){",
 				"	vec4 transformedPosition ="+suvTextureTransformationInverse+"[volumeNumber]*vec4(positionOnRay.xyz,1.0); ",
-				"	transformedPosition /= transformedPosition.w;",	
+				"	transformedPosition /= transformedPosition.w;",
 				"	return transformedPosition.xyz;",
 				"}",
 				"",
@@ -251,8 +251,7 @@ public class MultiVolumeRendererShaderSource extends AbstractShaderSource{
 				"		if(!(dist > 0.0)){",
 				"			continue;",
 				"		}",
-				"",
-				"		int stepsInRect = int(floor(abs(dist)/ (abs("+sgvRayDirections+"[p]) * "+suvRenderRectStepSize+")));",
+				"		int stepsInRect = int(floor(abs(dist)/ max("+scvMinDelta+",(abs("+sgvRayDirections+"[p]) * "+suvRenderRectStepSize+"))));",
 				"		steps = min(steps, stepsInRect);",
 				"	}",
 				"	return steps;",
@@ -302,7 +301,7 @@ public class MultiVolumeRendererShaderSource extends AbstractShaderSource{
 				"",
 				"int renderedSlice =0;",
 				"float latestdDistanceToSlice;",
-				"bool sliceNeedsGammaCorrection = (1.0/("+suvMaxVolumeValue+")*"+suvMinVolumeValue+" < 0.05);",
+				"bool sliceNeedsGammaCorrection = (1.0/max("+scvMinDelta+",("+suvMaxVolumeValue+")*"+suvMinVolumeValue+") < 0.05);",
 				"void evaluate2DSlice(float density, float nextDensity){",
 				"	if("+suvShowSlice+" == 1 && renderedSlice != 1){",
 				"		vec4 sliceColor= vec4(0.0);  ",
@@ -310,11 +309,11 @@ public class MultiVolumeRendererShaderSource extends AbstractShaderSource{
 				"		if(sign(currentSliceDistance) != sign(latestdDistanceToSlice) || sign(currentSliceDistance) == 0 ){",			
 				"			float midDensity;",
 				"			float dist = abs(latestdDistanceToSlice);",
-				"			if(dist < 0.5){",
+				"			//if(dist < 0.5){",
 				"				midDensity = density;",
-				"			}else{",
-				" 				midDensity = density+(nextDensity-density)/dist;",
-				"			}",
+				"			//}else{",
+				" 				//midDensity = density+(nextDensity-density)/dist;",
+				"			//}",
 				"			sliceColor =vec4(midDensity,midDensity,midDensity,1.0);",
 				"			sliceColor.a  = 1.0;",
 				"			if(sliceNeedsGammaCorrection){",
@@ -342,9 +341,7 @@ public class MultiVolumeRendererShaderSource extends AbstractShaderSource{
 				"	//init positions, directions ,etc",
 				"	"+sgvRayDirections+" = normalize("+svRayStartCoordinate+" - "+suvEyePosition+" );",
 				"	"+sgvRayPositions+" = "+svRayStartCoordinate+";",	
-				/*TODO REMOVE DEBUG*/ "mat4x4 toGlobal["+scvMaxNumberOfVolumes+"];",
-				"	for(int n = 0; n < "+scvMaxNumberOfVolumes+"; n++){",//TODO REMOVE DEBUG
-				"toGlobal[n] = inverse("+suvTextureTransformationInverse+"[n]);",
+				"	for(int n = 0; n < "+scvMaxNumberOfVolumes+"; n++){",
 				"		vec3 tmp = "+suvVoxelCount+"[n];",
 				"	    vtextOffsets[n] = vec3(1.0/tmp);",
 				"	    vtextScales[n] = (vec3("+suvVoxelCount+"[n]-ivec3(1)))/(vec3("+suvVoxelCount+"[n])*vec3("+suvVoxelCount+"[n]-ivec3(1)));",

src/main/java/bdv/jogl/VolumeRenderer/utils/VolumeDataManager.java

@@ -235,11 +235,22 @@ public class VolumeDataManager {
 		List<SourceState<?>> sources = state.getSources();
 		int currentTimepoint = state.getCurrentTimepoint();
 		List<VolumeDataBlock> data = new ArrayList<VolumeDataBlock>();
-		
-		
+/*		System.out.println();
+		System.out.println();
+		System.out.println("Timepoints: "+state.getNumTimePoints());
+	*/	
 		int i =-1;
 		for(SourceState<?> source : sources){
-
+		/*	System.out.println(source.getSpimSource().getNumMipmapLevels());
+			for(int k = 0;  k < source.getSpimSource().getNumMipmapLevels();k++){
+				long dim[] = new long[3];
+				source.getSpimSource().getSource(currentTimepoint, k).dimensions(dim);
+				for(int d= 0; d < 3; d++){
+					System.out.print(dim[d] +" ");
+				}
+				System.out.println();
+			}*/
+			
 			i++;
 
 			//block transform

src/main/java/bdv/jogl/VolumeRenderer/utils/VolumeDataUtils.java

@@ -66,7 +66,7 @@ public class VolumeDataUtils {
 
 		long minMax[][] = new long[][]{{(long)Math.max(Math.floor(minBoundingBox.getMinX()),0),(long)Math.max(Math.floor(minBoundingBox.getMinY()),0),(long)Math.max(Math.floor(minBoundingBox.getMinZ()),0)},
 				{Math.min((long)Math.ceil(minBoundingBox.getMaxX()), data.dimensions[0])-1,Math.min((long)Math.ceil(minBoundingBox.getMaxY()), data.dimensions[1])-1,Math.min((long)Math.ceil(minBoundingBox.getMaxZ()), data.dimensions[2])-1}};
-		float[] block = new float[(int)((minMax[1][0]+1-minMax[0][0]) * (minMax[1][1]+1-minMax[0][1]) * (minMax[1][2]+1-minMax[0][2]))];
+		float[] block = new float[Math.max(0,(int)((minMax[1][0]+1-minMax[0][0]) * (minMax[1][1]+1-minMax[0][1]) * (minMax[1][2]+1-minMax[0][2])))];
 
 		tmp = Views.flatIterable(Views.interval(dataField, minMax[0], minMax[1]));