Update

resources/main/ShadowExtrudeDirLightFinite.vert

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+#include <OgreUnifiedShader.h>
+
+// Directional light extrude - FINITE
+uniform mat4 worldviewproj_matrix;
+uniform vec4 light_position_object_space; // homogenous, object space
+uniform float shadow_extrusion_distance;  // how far to extrude
+
+MAIN_PARAMETERS
+IN(vec4 uv0, TEXCOORD0)
+IN(vec4 position, POSITION)
+MAIN_DECLARATION
+{
+    // Extrusion in object space
+    // Vertex unmodified if w==1, extruded if w==0
+    vec3 extrusionDir = - light_position_object_space.xyz;
+    extrusionDir = normalize(extrusionDir);
+
+    vec4 newpos = vec4(position.xyz +
+        ((1.0 - uv0.x) * shadow_extrusion_distance * extrusionDir), 1.0);
+
+    gl_Position = mul(worldviewproj_matrix, newpos);
+}