Some fixes for the ALS overlay shader

Effects/terrain-overlay.eff

@@ -151,6 +151,7 @@
       </texture-unit>
       <program>
         <vertex-shader>Shaders/terrain-ALS-ultra.vert</vertex-shader>
+	<vertex-shader>Shaders/filters-ALS.vert</vertex-shader>
         <fragment-shader>Shaders/terrain-ALS-ultra.frag</fragment-shader>
         <fragment-shader>Shaders/noise.frag</fragment-shader>
         <fragment-shader>Shaders/cloud-shadowfunc.frag</fragment-shader>
@@ -714,9 +715,9 @@
                 <vertex-shader>Shaders/grass-ALS.vert</vertex-shader>
                 <geometry-shader>Shaders/terrain-overlay-ALS.geom</geometry-shader>
                 <fragment-shader>Shaders/terrain-overlay-ALS.frag</fragment-shader>
-				<fragment-shader>Shaders/noise.frag</fragment-shader>
-				<fragment-shader>Shaders/filters-ALS.frag</fragment-shader>
-				<fragment-shader>Shaders/cloud-shadowfunc.frag</fragment-shader>
+		<fragment-shader>Shaders/noise.frag</fragment-shader>
+		<fragment-shader>Shaders/filters-ALS.frag</fragment-shader>
+		<fragment-shader>Shaders/cloud-shadowfunc.frag</fragment-shader>
                 <geometry-vertices-out type="int">96</geometry-vertices-out>
                 <geometry-input-type>triangles</geometry-input-type>
                 <geometry-output-type>triangle-strip</geometry-output-type>

Shaders/cloud-shadowfunc.frag

@@ -40,6 +40,9 @@ uniform float cloudpos19_y;
 uniform float cloudpos20_x;
 uniform float cloudpos20_y;
 
+uniform float cloudpos_n_x;
+uniform float cloudpos_n_y;
+
 float shadow_func (in float x, in float y, in float noise, in float dist)
 {
 
@@ -135,3 +138,19 @@ shadeValue = shadeValue * (1.0 - smoothstep(15000.0, 30000.0,dist));
 return 1.0 - shadeValue;
 
 }
+
+
+float shadow_func_nearest (in float x, in float y, in float noise, in float dist)
+{
+
+if (dist > 6000.0) {return 1.0;}
+
+float width =  fract((cloudpos_n_x)) * 5000.0;
+float strength = fract((cloudpos_n_y));
+
+
+float dlength = length( vec2 (x - cloudpos_n_x, y - cloudpos_n_y));
+float shadeValue = strength * (1.0-smoothstep(width * 0.5, width, dlength));
+
+return 1.0 - shadeValue;
+}

Shaders/terrain-overlay-ALS.frag

@@ -36,10 +36,8 @@ uniform float osg_SimulationTime;
 varying vec2 g_rawpos;                  // Horizontal position in model space
 varying float g_distance_to_eye;        // Distance to the camera. Layers were disregarded
 varying vec3 g_normal;
-varying in float g_altitude;
-
-
-flat in float g_layer;				       // The layer where the fragment lives (0-1 range)
+varying float g_altitude;
+varying float g_layer;				       // The layer where the fragment lives (0-1 range)
 
 
 float rand2D(in vec2 co);

Shaders/terrain-overlay-ALS.geom

@@ -14,9 +14,7 @@ varying out vec2 g_rawpos;
 varying out float g_distance_to_eye;
 varying out vec3 g_normal;
 varying out float g_altitude;
-
-
-flat varying out float g_layer;
+varying out float g_layer;