diff --git a/README.md b/README.md
index 7d539185..e3f9d814 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ A growing library of assorted data structures, algorithms and utilities.
 - [`orx-camera`](orx-camera/README.md), 3d camera and controls
 - [`orx-compositor`](orx-compositor/README.md), a simple toolkit to make composite (layered) images
 - [`orx-filter-extension`](orx-filter-extension/README.md), Program extension method that provides Filter based `extend()`
-- [`orx-integral-image`](orx-integral-image/README.md), a CPU-based implementation for integral images (summed area tables)
+- [`orx-integral-image`](orx-integral-image/README.md), CPU-based and GPU-based implementation for integral images (summed area tables)
 - `orx-jumpflood`, a filter/shader based implementation of the jump flood algorithm for finding fast approximate (directional) distance fields
 - `orx-kdtree`, a kd-tree implementation for fast nearest point searches
 - [`orx-mesh-generators`](orx-mesh-generators/README.md), triangular mesh generators
@@ -16,7 +16,7 @@ A growing library of assorted data structures, algorithms and utilities.
 - [`orx-obj-loader`](orx-obj-loader/README.md), simple Wavefront .obj mesh loader
 
 ## Usage
-ORX 0.0.19 is built against OPENRNDR 0.3.32, make sure you use this version in your project. Because OPENRNDR's API is pre 1.0 it tends to change from time to time.
+ORX 0.0.20 is built against OPENRNDR 0.3.32, make sure you use this version in your project. Because OPENRNDR's API is pre 1.0 it tends to change from time to time.
 
 The easiest way to add ORX to your project is through the use of Jitpack. [Jitpack](http://jitpack.io) is a service that pulls Gradle based libraries from Github, builds them and serves the jar files.
 
@@ -30,13 +30,13 @@ repositories {
 You can then add any of the ORX artifacts to your `dependencies {}`:
 ```
 dependencies {
-    compile 'com.github.openrndr.orx:<orx-artifact>:v0.0.19'
+    compile 'com.github.openrndr.orx:<orx-artifact>:v0.0.20'
 }
 ```
 
 For example if you want to use the `orx-no-clear` artifact one would use:
 ```
 dependencies {
-    compile 'com.github.openrndr.orx:orx-no-clear:v0.0.19'
+    compile 'com.github.openrndr.orx:orx-no-clear:v0.0.20'
 }
 ```
diff --git a/ShaderError.txt b/ShaderError.txt
deleted file mode 100644
index ffda7e1a..00000000
--- a/ShaderError.txt
+++ /dev/null
@@ -1,24 +0,0 @@
-#version 330 core
-
-uniform sampler2D tex0;
-in vec2 v_texCoord0;
-
-out vec4 o_color;
-
-void main() {
-    vec2 step = 1.0 / textureSize(tex0, 0);
-    float ref = step(0.5 , texture(tex0, v_texCoord0).r);
-    vec4 outc = vec4(-1.0, -1.0, 0.0, 1.0);
-
-    float contour = 0.0;
-    for (y = -1; y <= 1; ++y) {
-        for (x = -1; x <= 1; ++x) {
-            float smp = step(0.5, texture(tex0, v_texCoord0 + vec2(x,y) * step).r);
-            if (smp != ref) {
-                contour = 1.0;
-            }
-        }
-    }
-
-    o_color = vec4(contour, contour, contour, 1.0);
-}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 98987056..d263776d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -13,7 +13,7 @@ repositories {
 }
 
 ext {
-    openrndrVersion = "0.3.32-rc1"
+    openrndrVersion = "0.3.32-rc4"
 }
 
 subprojects {
diff --git a/orx-examples/build.gradle b/orx-examples/build.gradle
deleted file mode 100644
index 5ddae250..00000000
--- a/orx-examples/build.gradle
+++ /dev/null
@@ -1,31 +0,0 @@
-plugins {
-    id 'org.jetbrains.kotlin.jvm' version '1.2.71'
-}
-
-group 'org.openrndr.extra'
-version '0.0.1'
-
-repositories {
-    mavenCentral()
-    maven {
-        url "https://dl.bintray.com/openrndr/openrndr"
-    }
-}
-
-ext.openrndrVersion = "0.3.26"
-ext.orxVersion = "0.0.5"
-dependencies {
-    compile "org.openrndr.extra:orx:0.0.1"
-    compile "org.openrndr.extra:orx-jumpflood:$orxVersion"
-    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
-    compile "org.openrndr:openrndr-core:$openrndrVersion"
-    runtime "org.openrndr:openrndr-gl3:$openrndrVersion"
-    runtime "org.openrndr:openrndr-gl3-natives-windows:$openrndrVersion"
-}
-
-compileKotlin {
-    kotlinOptions.jvmTarget = "1.8"
-}
-compileTestKotlin {
-    kotlinOptions.jvmTarget = "1.8"
-}
\ No newline at end of file
diff --git a/orx-examples/gradle/wrapper/gradle-wrapper.jar b/orx-examples/gradle/wrapper/gradle-wrapper.jar
deleted file mode 100644
index 1948b907..00000000
Binary files a/orx-examples/gradle/wrapper/gradle-wrapper.jar and /dev/null differ
diff --git a/orx-examples/gradle/wrapper/gradle-wrapper.properties b/orx-examples/gradle/wrapper/gradle-wrapper.properties
deleted file mode 100644
index b1443f31..00000000
--- a/orx-examples/gradle/wrapper/gradle-wrapper.properties
+++ /dev/null
@@ -1,6 +0,0 @@
-#Fri Oct 05 14:22:23 CEST 2018
-distributionBase=GRADLE_USER_HOME
-distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
-zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.8-all.zip
diff --git a/orx-examples/gradlew b/orx-examples/gradlew
deleted file mode 100644
index cccdd3d5..00000000
--- a/orx-examples/gradlew
+++ /dev/null
@@ -1,172 +0,0 @@
-#!/usr/bin/env sh
-
-##############################################################################
-##
-##  Gradle start up script for UN*X
-##
-##############################################################################
-
-# Attempt to set APP_HOME
-# Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
-done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
-
-APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
-
-# Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
-
-warn () {
-    echo "$*"
-}
-
-die () {
-    echo
-    echo "$*"
-    echo
-    exit 1
-}
-
-# OS specific support (must be 'true' or 'false').
-cygwin=false
-msys=false
-darwin=false
-nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
-esac
-
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
-
-# Determine the Java command to use to start the JVM.
-if [ -n "$JAVA_HOME" ] ; then
-    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
-        # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
-    else
-        JAVACMD="$JAVA_HOME/bin/java"
-    fi
-    if [ ! -x "$JAVACMD" ] ; then
-        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
-
-Please set the JAVA_HOME variable in your environment to match the
-location of your Java installation."
-    fi
-else
-    JAVACMD="java"
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-
-Please set the JAVA_HOME variable in your environment to match the
-location of your Java installation."
-fi
-
-# Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
-fi
-
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=$((i+1))
-    done
-    case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
-    esac
-fi
-
-# Escape application args
-save () {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=$(save "$@")
-
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
-
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
-exec "$JAVACMD" "$@"
diff --git a/orx-examples/gradlew.bat b/orx-examples/gradlew.bat
deleted file mode 100644
index e95643d6..00000000
--- a/orx-examples/gradlew.bat
+++ /dev/null
@@ -1,84 +0,0 @@
-@if "%DEBUG%" == "" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto init
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:init
-@rem Get command-line arguments, handling Windows variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
-
-:end
-@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
diff --git a/orx-examples/settings.gradle b/orx-examples/settings.gradle
deleted file mode 100644
index b794b926..00000000
--- a/orx-examples/settings.gradle
+++ /dev/null
@@ -1,2 +0,0 @@
-rootProject.name = 'orx-examples'
-
diff --git a/orx-examples/src/main/kotlin/jumpfil-001.kt b/orx-examples/src/main/kotlin/jumpfil-001.kt
deleted file mode 100644
index b4e688a9..00000000
--- a/orx-examples/src/main/kotlin/jumpfil-001.kt
+++ /dev/null
@@ -1,56 +0,0 @@
-import org.openrndr.Program
-import org.openrndr.application
-import org.openrndr.color.ColorRGBa
-import org.openrndr.configuration
-import org.openrndr.draw.ColorType
-import org.openrndr.draw.colorBuffer
-import org.openrndr.extra.jumpfill.EncodePoints
-import org.openrndr.extra.jumpfill.JumpFlood
-
-class JumpFill001 : Program() {
-
-
-    var drawFunc = {}
-    override fun setup() {
-
-        val encodePoints = EncodePoints()
-        val jumpFill = JumpFlood()
-
-        val input = colorBuffer(512, 1024)
-        val coordinates =
-                listOf(colorBuffer(input.width, input.height, type = ColorType.FLOAT32),
-                        colorBuffer(input.width, input.height, type = ColorType.FLOAT32))
-
-        for (i in 0 until 100) {
-            input.shadow[(Math.random() * input.width).toInt(), (Math.random() * input.height).toInt()] =
-                    ColorRGBa.WHITE
-        }
-        input.shadow.upload()
-
-        drawFunc = {
-            encodePoints.apply(input, coordinates[0])
-            drawer.image(coordinates[0])
-            jumpFill.maxSteps = 10
-            for (i in 0 until 10) {
-                jumpFill.step = i
-                jumpFill.apply(coordinates[i % 2], coordinates[(i + 1) % 2])
-            }
-
-            drawer.image(coordinates[0])
-
-        }
-    }
-
-    override fun draw() {
-        drawFunc()
-    }
-}
-
-fun main(args: Array<String>) {
-    application(JumpFill001(), configuration {
-
-        width = 1024
-        height = 1024
-
-    })
-}
\ No newline at end of file
diff --git a/orx-examples/src/main/kotlin/jumpfil-002.kt b/orx-examples/src/main/kotlin/jumpfil-002.kt
deleted file mode 100644
index 0ebd8b75..00000000
--- a/orx-examples/src/main/kotlin/jumpfil-002.kt
+++ /dev/null
@@ -1,45 +0,0 @@
-import org.openrndr.Program
-import org.openrndr.application
-import org.openrndr.color.ColorRGBa
-import org.openrndr.configuration
-import org.openrndr.draw.colorBuffer
-import org.openrndr.extra.jumpfill.contourPoints
-import org.openrndr.extra.jumpfill.jumpFlood
-import org.openrndr.extra.jumpfill.threshold
-
-class JumpFill002 : Program() {
-
-    var drawFunc = {}
-    override fun setup() {
-
-        val input = colorBuffer(512, 1024)
-
-        for (i in 0 until 3) {
-            input.shadow[(Math.random() * input.width).toInt(), (Math.random() * input.height).toInt()] =
-                    ColorRGBa.WHITE
-        }
-        input.shadow.upload()
-
-        val result = jumpFlood(drawer, input)
-
-//        threshold.apply(result, result)
- //       contourPoints.apply(result, result)
-
-        drawFunc = {
-            drawer.image(result)
-        }
-    }
-
-    override fun draw() {
-        drawFunc()
-    }
-}
-
-fun main(args: Array<String>) {
-    application(JumpFill002(), configuration {
-
-        width = 1024
-        height = 1024
-
-    })
-}
\ No newline at end of file