diff --git a/effects/effect.cpp b/effects/effect.cpp
index 0f8a6da14..b72c17351 100644
--- a/effects/effect.cpp
+++ b/effects/effect.cpp
@@ -20,6 +20,7 @@
 #include "debug.h"
 #include "io/path.h"
 #include "mainwindow.h"
+#include "io/math.h"
 
 #include "effects/internal/transformeffect.h"
 #include "effects/internal/texteffect.h"
@@ -228,10 +229,6 @@ void EffectInit::run() {
 	dout << "[INFO] Finished initializing effects";
 }
 
-double double_lerp(double a, double b, double t) {
-    return ((1.0 - t) * a) + (t * b);
-}
-
 Effect::Effect(Clip* c, const EffectMeta *em) :
 	parent_clip(c),
     meta(em),
diff --git a/effects/effect.h b/effects/effect.h
index 0ff464bd6..5ac86f3fc 100644
--- a/effects/effect.h
+++ b/effects/effect.h
@@ -84,6 +84,8 @@ extern QMutex effects_loaded;
 #define TRAN_TYPE_CLOSEWLINK 4
 
 struct GLTextureCoords {
+    int grid_size;
+
 	int vertexTopLeftX;
 	int vertexTopLeftY;
 	int vertexTopRightX;
diff --git a/effects/internal/cornerpineffect.cpp b/effects/internal/cornerpineffect.cpp
index c3c57c35e..36c282902 100644
--- a/effects/internal/cornerpineffect.cpp
+++ b/effects/internal/cornerpineffect.cpp
@@ -5,19 +5,27 @@ CornerPinEffect::CornerPinEffect(Clip *c, const EffectMeta *em) : Effect(c, em)
 
     EffectRow* top_left = add_row("Top Left:");
     top_left_x = top_left->add_field(EFFECT_FIELD_DOUBLE);
+    top_left_x->id = "topleftx";
     top_left_y = top_left->add_field(EFFECT_FIELD_DOUBLE);
+    top_left_y->id = "toplefty";
 
     EffectRow* top_right = add_row("Top Right:");
     top_right_x = top_right->add_field(EFFECT_FIELD_DOUBLE);
+    top_right_x->id = "toprightx";
     top_right_y = top_right->add_field(EFFECT_FIELD_DOUBLE);
+    top_right_y->id = "toprighty";
 
     EffectRow* bottom_left = add_row("Bottom Left:");
     bottom_left_x = bottom_left->add_field(EFFECT_FIELD_DOUBLE);
+    bottom_left_x->id = "bottomleftx";
     bottom_left_y = bottom_left->add_field(EFFECT_FIELD_DOUBLE);
+    bottom_left_y->id = "bottomlefty";
 
     EffectRow* bottom_right = add_row("Bottom Right:");
     bottom_right_x = bottom_right->add_field(EFFECT_FIELD_DOUBLE);
+    bottom_right_x->id = "bottomrightx";
     bottom_right_y = bottom_right->add_field(EFFECT_FIELD_DOUBLE);
+    bottom_right_y->id = "bottomrighty";
 
 	connect(top_left_x, SIGNAL(changed()), this, SLOT(field_changed()));
 	connect(top_left_y, SIGNAL(changed()), this, SLOT(field_changed()));
@@ -30,6 +38,8 @@ CornerPinEffect::CornerPinEffect(Clip *c, const EffectMeta *em) : Effect(c, em)
 }
 
 void CornerPinEffect::process_coords(double timecode, GLTextureCoords &coords) {
+    coords.grid_size += 4;
+
     coords.vertexTopLeftX += top_left_x->get_double_value(timecode);
     coords.vertexTopLeftY += top_left_y->get_double_value(timecode);
 
diff --git a/io/math.cpp b/io/math.cpp
new file mode 100644
index 000000000..714f6ad90
--- /dev/null
+++ b/io/math.cpp
@@ -0,0 +1,9 @@
+#include "math.h"
+
+int lerp(int a, int b, double t) {
+    return ((1.0 - t) * a) + (t * b);
+}
+
+double double_lerp(double a, double b, double t) {
+    return ((1.0 - t) * a) + (t * b);
+}
diff --git a/io/math.h b/io/math.h
new file mode 100644
index 000000000..68264cff7
--- /dev/null
+++ b/io/math.h
@@ -0,0 +1,7 @@
+#ifndef MATH_H
+#define MATH_H
+
+int lerp(int a, int b, double t);
+double double_lerp(double a, double b, double t);
+
+#endif // MATH_H
diff --git a/olive.pro b/olive.pro
index c548f9532..aa8deb58f 100644
--- a/olive.pro
+++ b/olive.pro
@@ -83,7 +83,8 @@ SOURCES += \
     effects/internal/shakeeffect.cpp \
     effects/internal/exponentialfadetransition.cpp \
     effects/internal/logarithmicfadetransition.cpp \
-    effects/internal/cornerpineffect.cpp
+    effects/internal/cornerpineffect.cpp \
+    io/math.cpp
 
 HEADERS += \
         mainwindow.h \
@@ -147,7 +148,8 @@ HEADERS += \
     effects/internal/crossdissolvetransition.h \
     effects/internal/exponentialfadetransition.h \
     effects/internal/logarithmicfadetransition.h \
-    effects/internal/cornerpineffect.h
+    effects/internal/cornerpineffect.h \
+    io/math.h
 
 FORMS += \
         mainwindow.ui \
diff --git a/panels/timeline.cpp b/panels/timeline.cpp
index a4471f064..f19414912 100644
--- a/panels/timeline.cpp
+++ b/panels/timeline.cpp
@@ -352,10 +352,6 @@ void Timeline::delete_selection(QVector<Selection>& selections, bool ripple_dele
 	}
 }
 
-int lerp(int a, int b, double t) {
-	return ((1.0 - t) * a) + (t * b);
-}
-
 void Timeline::set_zoom_value(double v) {
 	zoom = v;
 	ui->headers->update_zoom(zoom);
diff --git a/panels/timeline.h b/panels/timeline.h
index 3528c3e0e..8af2cab63 100644
--- a/panels/timeline.h
+++ b/panels/timeline.h
@@ -28,7 +28,6 @@ struct Clip;
 struct Media;
 struct MediaStream;
 
-int lerp(int a, int b, double t);
 long refactor_frame_number(long framenumber, double source_frame_rate, double target_frame_rate);
 int getScreenPointFromFrame(double zoom, long frame);
 long getFrameFromScreenPoint(double zoom, int x);
diff --git a/ui/viewerwidget.cpp b/ui/viewerwidget.cpp
index 08c8e3c89..cb5a79f55 100644
--- a/ui/viewerwidget.cpp
+++ b/ui/viewerwidget.cpp
@@ -13,6 +13,7 @@
 #include "playback/cacher.h"
 #include "io/config.h"
 #include "debug.h"
+#include "io/math.h"
 
 #include <QPainter>
 #include <QAudioOutput>
@@ -376,6 +377,7 @@ GLuint ViewerWidget::compose_sequence(QVector<Clip*>& nests, bool render_audio)
 					fbo_switcher = !fbo_switcher;
 
 					GLTextureCoords coords;
+                    coords.grid_size = 1;
 					coords.vertexTopLeftX = coords.vertexBottomLeftX = -video_width/2;
 					coords.vertexTopLeftY = coords.vertexTopRightY = -video_height/2;
 					coords.vertexTopRightX = coords.vertexBottomRightX = video_width/2;
@@ -434,14 +436,49 @@ GLuint ViewerWidget::compose_sequence(QVector<Clip*>& nests, bool render_audio)
 					glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
 					glBegin(GL_QUADS);
-					glTexCoord2f(coords.textureTopLeftX, coords.textureTopLeftY); // top left
-					glVertex2f(coords.vertexTopLeftX, coords.vertexTopLeftY); // top left
-					glTexCoord2f(coords.textureTopRightX, coords.textureTopRightY); // top right
-					glVertex2f(coords.vertexTopRightX, coords.vertexTopRightY); // top right
-					glTexCoord2f(coords.textureBottomRightX, coords.textureBottomRightY); // bottom right
-					glVertex2f(coords.vertexBottomRightX, coords.vertexBottomRightY); // bottom right
-					glTexCoord2f(coords.textureBottomLeftX, coords.textureBottomLeftY); // bottom left
-					glVertex2f(coords.vertexBottomLeftX, coords.vertexBottomLeftY); // bottom left
+
+                    if (coords.grid_size <= 1) {
+                        glTexCoord2f(coords.textureTopLeftX, coords.textureTopLeftY); // top left
+                        glVertex2f(coords.vertexTopLeftX, coords.vertexTopLeftY); // top left
+                        glTexCoord2f(coords.textureTopRightX, coords.textureTopRightY); // top right
+                        glVertex2f(coords.vertexTopRightX, coords.vertexTopRightY); // top right
+                        glTexCoord2f(coords.textureBottomRightX, coords.textureBottomRightY); // bottom right
+                        glVertex2f(coords.vertexBottomRightX, coords.vertexBottomRightY); // bottom right
+                        glTexCoord2f(coords.textureBottomLeftX, coords.textureBottomLeftY); // bottom left
+                        glVertex2f(coords.vertexBottomLeftX, coords.vertexBottomLeftY); // bottom left
+                    } else {
+                        double rows = coords.grid_size;
+                        double cols = coords.grid_size;
+
+                        for (double i=0;i<rows;i++) {
+                            double row_prog = i/rows;
+                            double next_row_prog = (i+1)/rows;
+                            for (double j=0;j<cols;j++) {
+                                double col_prog = j/cols;
+                                double next_col_prog = (j+1)/cols;
+
+                                double vertexTLX = double_lerp(coords.vertexTopLeftX, coords.vertexBottomLeftX, row_prog);
+                                double vertexTRX = double_lerp(coords.vertexTopRightX, coords.vertexBottomRightX, row_prog);
+                                double vertexBLX = double_lerp(coords.vertexTopLeftX, coords.vertexBottomLeftX, next_row_prog);
+                                double vertexBRX = double_lerp(coords.vertexTopRightX, coords.vertexBottomRightX, next_row_prog);
+
+                                double vertexTLY = double_lerp(coords.vertexTopLeftY, coords.vertexTopRightY, col_prog);
+                                double vertexTRY = double_lerp(coords.vertexTopLeftY, coords.vertexTopRightY, next_col_prog);
+                                double vertexBLY = double_lerp(coords.vertexBottomLeftY, coords.vertexBottomRightY, col_prog);
+                                double vertexBRY = double_lerp(coords.vertexBottomLeftY, coords.vertexBottomRightY, next_col_prog);
+
+                                glTexCoord2f(double_lerp(coords.textureTopLeftX, coords.textureTopRightX, col_prog), double_lerp(coords.textureTopLeftY, coords.textureBottomLeftY, row_prog)); // top left
+                                glVertex2f(double_lerp(vertexTLX, vertexTRX, col_prog), double_lerp(vertexTLY, vertexBLY, row_prog)); // top left
+                                glTexCoord2f(double_lerp(coords.textureTopLeftX, coords.textureTopRightX, next_col_prog), double_lerp(coords.textureTopRightY, coords.textureBottomRightY, row_prog)); // top right
+                                glVertex2f(double_lerp(vertexTLX, vertexTRX, next_col_prog), double_lerp(vertexTRY, vertexBRY, row_prog)); // top right
+                                glTexCoord2f(double_lerp(coords.textureBottomLeftX, coords.textureBottomRightX, next_col_prog), double_lerp(coords.textureTopRightY, coords.textureBottomRightY, next_row_prog)); // bottom right
+                                glVertex2f(double_lerp(vertexBLX, vertexBRX, next_col_prog), double_lerp(vertexTRY, vertexBRY, next_row_prog)); // bottom right
+                                glTexCoord2f(double_lerp(coords.textureBottomLeftX, coords.textureBottomRightX, col_prog), double_lerp(coords.textureTopLeftY, coords.textureBottomLeftY, next_row_prog)); // bottom left
+                                glVertex2f(double_lerp(vertexBLX, vertexBRX, col_prog), double_lerp(vertexTLY, vertexBLY, next_row_prog)); // bottom left
+                            }
+                        }
+                    }
+
 					glEnd();
 
 					glBindTexture(GL_TEXTURE_2D, 0);