diff --git a/src/main/java/ca/blarg/gdx/GameApp.java b/src/main/java/ca/blarg/gdx/GameApp.java
index fca56b0..42fcf67 100644
--- a/src/main/java/ca/blarg/gdx/GameApp.java
+++ b/src/main/java/ca/blarg/gdx/GameApp.java
@@ -60,12 +60,12 @@ public abstract class GameApp implements Disposable {
 		viewportContext.onResize(width, height);
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 		viewportContext.onPreRender();
 		spriteBatch.setProjectionMatrix(viewportContext.getOrthographicCamera().combined);
 		spriteBatch.setPixelScale(viewportContext.pixelScaler.getScale());
 
-		stateManager.onRender(delta);
+		stateManager.onRender(interpolation);
 
 		viewportContext.onPostRender();
 	}
diff --git a/src/main/java/ca/blarg/gdx/GameLooper.java b/src/main/java/ca/blarg/gdx/GameLooper.java
index 9420128..1b6f1d6 100644
--- a/src/main/java/ca/blarg/gdx/GameLooper.java
+++ b/src/main/java/ca/blarg/gdx/GameLooper.java
@@ -6,5 +6,5 @@ public interface GameLooper {
 	int getUpdateFrequency();
 
 	float getUpdateDelta();
-	float getRenderDelta();
+	float getRenderInterpolation();
 }
diff --git a/src/main/java/ca/blarg/gdx/GdxGameAppListener.java b/src/main/java/ca/blarg/gdx/GdxGameAppListener.java
index 4053a0a..0f844c1 100644
--- a/src/main/java/ca/blarg/gdx/GdxGameAppListener.java
+++ b/src/main/java/ca/blarg/gdx/GdxGameAppListener.java
@@ -8,10 +8,10 @@ public class GdxGameAppListener implements ApplicationListener, GameLooper {
 	int updateFrequency;
 	float maxFrameTime;
 
-	float accumulator;
+	float accumulator = 0.0f;
 
 	float updateDelta = 0.0f;
-	float renderDelta = 0.0f;
+	float renderInterpolation = 0.0f;
 
 	Class<? extends GameApp> gameAppType;
 	GameApp gameApp;
@@ -65,10 +65,10 @@ public class GdxGameAppListener implements ApplicationListener, GameLooper {
 			accumulator -= updateDelta;
 		}
 
-		renderDelta = accumulator / updateDelta;
+		renderInterpolation = accumulator / updateDelta;
 
 		gameApp.onUpdateFrame(frameTime);
-		gameApp.onRender(renderDelta);
+		gameApp.onRender(renderInterpolation);
 	}
 
 	@Override
@@ -109,7 +109,7 @@ public class GdxGameAppListener implements ApplicationListener, GameLooper {
 	}
 
 	@Override
-	public float getRenderDelta() {
-		return renderDelta;
+	public float getRenderInterpolation() {
+		return renderInterpolation;
 	}
 }
diff --git a/src/main/java/ca/blarg/gdx/entities/ComponentSystem.java b/src/main/java/ca/blarg/gdx/entities/ComponentSystem.java
index 141f500..c13200e 100644
--- a/src/main/java/ca/blarg/gdx/entities/ComponentSystem.java
+++ b/src/main/java/ca/blarg/gdx/entities/ComponentSystem.java
@@ -25,7 +25,7 @@ public abstract class ComponentSystem extends EventHandler implements Disposable
 	public void onResize() {
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 	}
 
 	public void onUpdateGameState(float delta) {
diff --git a/src/main/java/ca/blarg/gdx/entities/EntityManager.java b/src/main/java/ca/blarg/gdx/entities/EntityManager.java
index f139ec9..9e23551 100644
--- a/src/main/java/ca/blarg/gdx/entities/EntityManager.java
+++ b/src/main/java/ca/blarg/gdx/entities/EntityManager.java
@@ -307,9 +307,9 @@ public class EntityManager implements Disposable {
 			componentSystems.get(i).onResize();
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 		for (int i = 0; i < componentSystems.size; ++i)
-			componentSystems.get(i).onRender(delta);
+			componentSystems.get(i).onRender(interpolation);
 	}
 
 	public void onUpdateGameState(float delta) {
diff --git a/src/main/java/ca/blarg/gdx/graphics/screeneffects/DimScreenEffect.java b/src/main/java/ca/blarg/gdx/graphics/screeneffects/DimScreenEffect.java
index 18d423a..035bec2 100644
--- a/src/main/java/ca/blarg/gdx/graphics/screeneffects/DimScreenEffect.java
+++ b/src/main/java/ca/blarg/gdx/graphics/screeneffects/DimScreenEffect.java
@@ -6,10 +6,6 @@ import ca.blarg.gdx.graphics.SolidColorTextureCache;
 import ca.blarg.gdx.graphics.ViewportContext;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.Texture;
-import ca.blarg.gdx.Services;
-import ca.blarg.gdx.graphics.ExtendedSpriteBatch;
-import ca.blarg.gdx.graphics.SolidColorTextureCache;
-import ca.blarg.gdx.graphics.ViewportContext;
 
 public class DimScreenEffect extends ScreenEffect
 {
@@ -38,7 +34,7 @@ public class DimScreenEffect extends ScreenEffect
 	}
 
 	@Override
-	public void onRender(float delta)
+	public void onRender(float interpolation)
 	{
 		renderColor.set(color);
 		renderColor.a = alpha;
diff --git a/src/main/java/ca/blarg/gdx/graphics/screeneffects/FadeScreenEffect.java b/src/main/java/ca/blarg/gdx/graphics/screeneffects/FadeScreenEffect.java
index edc483a..4d4b575 100644
--- a/src/main/java/ca/blarg/gdx/graphics/screeneffects/FadeScreenEffect.java
+++ b/src/main/java/ca/blarg/gdx/graphics/screeneffects/FadeScreenEffect.java
@@ -65,7 +65,7 @@ public class FadeScreenEffect extends ScreenEffect
 	}
 
 	@Override
-	public void onRender(float delta)
+	public void onRender(float interpolation)
 	{
 		Texture texture = solidColorTextures.get(Color.WHITE);
 		color.a = alpha;
diff --git a/src/main/java/ca/blarg/gdx/graphics/screeneffects/FlashScreenEffect.java b/src/main/java/ca/blarg/gdx/graphics/screeneffects/FlashScreenEffect.java
index 2b2b51e..3e38f00 100644
--- a/src/main/java/ca/blarg/gdx/graphics/screeneffects/FlashScreenEffect.java
+++ b/src/main/java/ca/blarg/gdx/graphics/screeneffects/FlashScreenEffect.java
@@ -41,7 +41,7 @@ public class FlashScreenEffect extends ScreenEffect
 	}
 
 	@Override
-	public void onRender(float delta)
+	public void onRender(float interpolation)
 	{
 		Texture texture = solidColorTextures.get(Color.WHITE);
 		color.a = alpha;
diff --git a/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffect.java b/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffect.java
index 8b6093a..403917a 100644
--- a/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffect.java
+++ b/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffect.java
@@ -25,7 +25,7 @@ public abstract class ScreenEffect implements Disposable
 	public void onResize() {
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 	}
 
 	public void onUpdateGameState(float delta) {
diff --git a/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffectManager.java b/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffectManager.java
index fa53f68..f404378 100644
--- a/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffectManager.java
+++ b/src/main/java/ca/blarg/gdx/graphics/screeneffects/ScreenEffectManager.java
@@ -103,25 +103,25 @@ public class ScreenEffectManager implements Disposable
 			effects.get(i).effect.onResize();
 	}
 
-	public void onRenderLocal(float delta) {
+	public void onRenderLocal(float interpolation) {
 		if (numLocalEffects == 0)
 			return;
 
 		for (int i = 0; i < effects.size(); ++i) {
 			EffectInfo effectInfo = effects.get(i);
 			if (effectInfo.isLocal)
-				effectInfo.effect.onRender(delta);
+				effectInfo.effect.onRender(interpolation);
 		}
 	}
 
-	public void onRenderGlobal(float delta) {
+	public void onRenderGlobal(float interpolation) {
 		if (numGlobalEffects == 0)
 			return;
 
 		for (int i = 0; i < effects.size(); ++i) {
 			EffectInfo effectInfo = effects.get(i);
 			if (!effectInfo.isLocal)
-				effectInfo.effect.onRender(delta);
+				effectInfo.effect.onRender(interpolation);
 		}
 	}
 
diff --git a/src/main/java/ca/blarg/gdx/processes/GameProcess.java b/src/main/java/ca/blarg/gdx/processes/GameProcess.java
index 999b45b..8936a8b 100644
--- a/src/main/java/ca/blarg/gdx/processes/GameProcess.java
+++ b/src/main/java/ca/blarg/gdx/processes/GameProcess.java
@@ -54,7 +54,7 @@ public abstract class GameProcess extends EventHandler implements Disposable {
 	public void onResize() {
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 	}
 
 	public void onUpdateGameState(float delta) {
diff --git a/src/main/java/ca/blarg/gdx/processes/ProcessManager.java b/src/main/java/ca/blarg/gdx/processes/ProcessManager.java
index 1afe2a1..e3aa7c8 100644
--- a/src/main/java/ca/blarg/gdx/processes/ProcessManager.java
+++ b/src/main/java/ca/blarg/gdx/processes/ProcessManager.java
@@ -188,11 +188,11 @@ public class ProcessManager implements Disposable {
 		}
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 		for (int i = 0; i < processes.size(); ++i) {
 			ProcessInfo processInfo = processes.get(i);
 			if (!processInfo.isInactive)
-				processInfo.process.onRender(delta);
+				processInfo.process.onRender(interpolation);
 		}
 	}
 
diff --git a/src/main/java/ca/blarg/gdx/states/GameState.java b/src/main/java/ca/blarg/gdx/states/GameState.java
index 99e4245..ebe5276 100644
--- a/src/main/java/ca/blarg/gdx/states/GameState.java
+++ b/src/main/java/ca/blarg/gdx/states/GameState.java
@@ -79,12 +79,12 @@ public abstract class GameState extends EventHandler implements Disposable {
 		effectManager.onResize();
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 		// switch it up and do effects before processes here so that processes
 		// (which would commonly be used for UI overlay elements) don't get
 		// overwritten by local effects (e.g. flashes, etc.)
-		effectManager.onRenderLocal(delta);
-		processManager.onRender(delta);
+		effectManager.onRenderLocal(interpolation);
+		processManager.onRender(interpolation);
 	}
 
 	public void onUpdateGameState(float delta) {
diff --git a/src/main/java/ca/blarg/gdx/states/StateManager.java b/src/main/java/ca/blarg/gdx/states/StateManager.java
index 50d5751..89dd829 100644
--- a/src/main/java/ca/blarg/gdx/states/StateManager.java
+++ b/src/main/java/ca/blarg/gdx/states/StateManager.java
@@ -253,12 +253,12 @@ public class StateManager implements Disposable {
 		}
 	}
 
-	public void onRender(float delta) {
+	public void onRender(float interpolation) {
 		for (int i = getTopNonOverlayIndex(); i != -1 && i < states.size(); ++i) {
 			StateInfo stateInfo = states.get(i);
 			if (!stateInfo.isInactive) {
-				stateInfo.state.onRender(delta);
-				stateInfo.state.effectManager.onRenderGlobal(delta);
+				stateInfo.state.onRender(interpolation);
+				stateInfo.state.effectManager.onRenderGlobal(interpolation);
 			}
 		}
 	}