diff --git a/include/EMaterialTypes.h b/include/EMaterialTypes.h
index 75f95d36..086ca345 100644
--- a/include/EMaterialTypes.h
+++ b/include/EMaterialTypes.h
@@ -101,7 +101,7 @@ namespace video
 		EMT_TRANSPARENT_ALPHA_CHANNEL,
 
 		//! Makes the material transparent based on the texture alpha channel.
-		/** If the alpha channel value is greater than a certain value (default 127), a
+		/** If the alpha channel value is greater than 127, a
 		pixel is written to the target, otherwise not. This
 		material does not use alpha blending and is a lot faster
 		than EMT_TRANSPARENT_ALPHA_CHANNEL. It is ideal for drawing
@@ -109,12 +109,7 @@ namespace video
 		blurry but sharp. Only first texture is used. If you are
 		using this material with small textures and 3d object, it
 		is a good idea to load the texture in 32 bit mode
-		(video::IVideoDriver::setTextureCreationFlag()). 
-		By changing SMaterial::MaterialTypeParam you can control the value which is used 
-		to seperate transparent and opaque pixels. The range is 0-1 (corresponding to 0-255 values
-		for the alpha-channel test). 0 is special and like 0.5 interpreted as 127 
-		(if you really want no transparency at all use a very small value above 0)
-		*/
+		(video::IVideoDriver::setTextureCreationFlag()). */
 		EMT_TRANSPARENT_ALPHA_CHANNEL_REF,
 
 		//! Makes the material transparent based on the vertex alpha value.
diff --git a/source/Irrlicht/CD3D8MaterialRenderer.h b/source/Irrlicht/CD3D8MaterialRenderer.h
index bb1ba011..2b257bb3 100644
--- a/source/Irrlicht/CD3D8MaterialRenderer.h
+++ b/source/Irrlicht/CD3D8MaterialRenderer.h
@@ -350,9 +350,7 @@ public:
 	{
 		services->setBasicRenderStates(material, lastMaterial, resetAllRenderstates);
 
-		if (material.MaterialType != lastMaterial.MaterialType 
-			|| material.MaterialTypeParam != lastMaterial.MaterialTypeParam 
-			|| resetAllRenderstates)
+		if (material.MaterialType != lastMaterial.MaterialType || resetAllRenderstates)
 		{
 			setTextureColorStage(pID3DDevice, 0,
 				D3DTA_TEXTURE, D3DTOP_MODULATE, D3DTA_CURRENT);
@@ -362,7 +360,8 @@ public:
 
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
 
-			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, material.MaterialTypeParam == 0 ? 127 : material.MaterialTypeParam * 255.f);
+			// 127 is required by EMT_TRANSPARENT_ALPHA_CHANNEL_REF
+			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, 127);
 			pID3DDevice->SetRenderState(D3DRS_ALPHAFUNC, D3DCMP_GREATEREQUAL);
 			pID3DDevice->SetRenderState(D3DRS_ALPHATESTENABLE, TRUE);
 		}
diff --git a/source/Irrlicht/CD3D9MaterialRenderer.h b/source/Irrlicht/CD3D9MaterialRenderer.h
index c5e4b825..9241116d 100644
--- a/source/Irrlicht/CD3D9MaterialRenderer.h
+++ b/source/Irrlicht/CD3D9MaterialRenderer.h
@@ -381,9 +381,7 @@ public:
 	{
 		services->setBasicRenderStates(material, lastMaterial, resetAllRenderstates);
 
-		if (material.MaterialType != lastMaterial.MaterialType 
-			||	material.MaterialTypeParam != lastMaterial.MaterialTypeParam 
-			|| resetAllRenderstates)
+		if (material.MaterialType != lastMaterial.MaterialType || resetAllRenderstates)
 		{
 			setTextureColorStage(pID3DDevice, 0,
 				D3DTA_TEXTURE, D3DTOP_MODULATE, D3DTA_CURRENT);
@@ -393,7 +391,8 @@ public:
 
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
 
-			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, material.MaterialTypeParam == 0 ? 127 : material.MaterialTypeParam * 255.f);
+			// 127 is required by EMT_TRANSPARENT_ALPHA_CHANNEL_REF
+			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, 127);
 			pID3DDevice->SetRenderState(D3DRS_ALPHAFUNC, D3DCMP_GREATEREQUAL);
 			pID3DDevice->SetRenderState(D3DRS_ALPHATESTENABLE, TRUE);
 		}
diff --git a/source/Irrlicht/COpenGLMaterialRenderer.h b/source/Irrlicht/COpenGLMaterialRenderer.h
index 1d552841..e4dee3c3 100644
--- a/source/Irrlicht/COpenGLMaterialRenderer.h
+++ b/source/Irrlicht/COpenGLMaterialRenderer.h
@@ -495,12 +495,10 @@ public:
 		Driver->disableTextures(1);
 		Driver->setBasicRenderStates(material, lastMaterial, resetAllRenderstates);
 
-		if (material.MaterialType != lastMaterial.MaterialType 
-			|| material.MaterialTypeParam != lastMaterial.MaterialTypeParam
-			|| resetAllRenderstates)
+		if (material.MaterialType != lastMaterial.MaterialType || resetAllRenderstates)
 		{
 			Driver->getBridgeCalls()->setAlphaTest(true);
-			Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, material.MaterialTypeParam == 0 ? 0.5 : material.MaterialTypeParam);
+			Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, 0.5f);
 			glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 		}
 	}
@@ -508,7 +506,7 @@ public:
 	virtual void OnSetBaseMaterial(const SMaterial& material) _IRR_OVERRIDE_
 	{
 		Driver->getBridgeCalls()->setAlphaTest(true);
-		Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, material.MaterialTypeParam == 0 ? 0.5 : material.MaterialTypeParam);
+		Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, 0.5f);
 	}
 
 	virtual void OnUnsetMaterial() _IRR_OVERRIDE_