Landmass update: add a triangle for the ground and don't apply relief on it

Effects/landmass.eff

@@ -80,7 +80,7 @@
         <vertex-shader>Shaders/landmass-g.vert</vertex-shader>
         <geometry-shader>Shaders/landmass.geom</geometry-shader>
         <fragment-shader>Shaders/landmass.frag</fragment-shader>
-        <geometry-vertices-out type="int">16</geometry-vertices-out>
+        <geometry-vertices-out type="int">20</geometry-vertices-out>
         <geometry-input-type>triangles</geometry-input-type>
         <geometry-output-type>triangle-strip</geometry-output-type>
         <attribute>

Shaders/landmass.frag

@@ -7,6 +7,7 @@ varying vec3  VTangent;
 varying vec3  VBinormal;
 varying vec3  Normal;
 varying vec4  constantColor;
+varying float bump;
 
 uniform sampler3D NoiseTex;
 uniform sampler2D BaseTex;
@@ -53,16 +54,26 @@ float ray_intersect(sampler2D reliefMap, vec2 dp, vec2 ds)
 
 void main (void)
 {
-	vec3 V = normalize(ecPosition.xyz);
-	float a = dot(VNormal, -V);
-	vec2 s = vec2(dot(V, VTangent), dot(V, VBinormal));
-	s *= depth_factor / a;
-	vec2 ds = s;
-	vec2 dp = gl_TexCoord[0].st;
-	float d = ray_intersect(NormalTex, dp, ds);
+	vec2 uv;
+	vec3 N;
+	if ( bump > 0.9 )
+	{
+		vec3 V = normalize(ecPosition.xyz);
+		float a = dot(VNormal, -V);
+		vec2 s = vec2(dot(V, VTangent), dot(V, VBinormal));
+		s *= depth_factor / a;
+		vec2 ds = s;
+		vec2 dp = gl_TexCoord[0].st;
+		float d = ray_intersect(NormalTex, dp, ds);
 
-	vec2 uv = dp + ds * d;
-	vec3 N = texture2D(NormalTex, uv).xyz * 2.0 - 1.0;
+		uv = dp + ds * d;
+		N = texture2D(NormalTex, uv).xyz * 2.0 - 1.0;
+	}
+	else
+	{
+		uv = gl_TexCoord[0].st;
+		N = vec3(0.0, 0.0, 1.0);
+	}
 
 
 	vec4 noisevec   = texture3D(NoiseTex, (rawpos.xyz)*0.01*scale);

Shaders/landmass.geom

@@ -13,6 +13,7 @@ varying out vec3 VTangent;
 varying out vec3 VBinormal;
 varying out vec3 Normal;
 varying out vec4 constantColor;
+varying out float bump;
 
 uniform float canopy_height;
 
@@ -41,6 +42,7 @@ void createVertex(int i, int j, float offset, float s)
 	VNormal = normalize(gl_NormalMatrix * Normal);
 	VTangent  = VTangentIn[i];
 	VBinormal = VBinormalIn[i];
+	bump = s;
 
 	gl_FrontColor = gl_FrontColorIn[i];
 	constantColor = gl_FrontMaterial.emission
@@ -72,4 +74,8 @@ void main(void)
 	createVertex(1, 2, canopy_height, 1.0);
 	createVertex(2, 0, canopy_height, 1.0);
 	EndPrimitive();
+	createVertex(0, 1, 0.0, 0.0);
+	createVertex(1, 2, 0.0, 0.0);
+	createVertex(2, 0, 0.0, 0.0);
+	EndPrimitive();
 }

Shaders/landmass.vert

@@ -5,6 +5,7 @@ varying vec3  VTangent;
 varying vec3  VBinormal;
 varying vec3  Normal;
 varying vec4  constantColor;
+varying float bump;
 
 attribute vec3 tangent;
 attribute vec3 binormal;
@@ -17,6 +18,7 @@ void main(void)
 	VNormal = gl_NormalMatrix * gl_Normal;
 	VTangent = gl_NormalMatrix * tangent;
 	VBinormal = gl_NormalMatrix * binormal;
+	bump = 1.0;
 
 	gl_FrontColor = gl_Color;
 	constantColor = gl_FrontMaterial.emission