Fixed warnings in Terrain shader.

Fixed the use of the first diffuse map
Fixed the camera positioning in the TestSpotLightTerrain

jme3-examples/src/main/java/jme3test/light/TestSpotLightTerrain.java

@@ -98,7 +98,7 @@ public class TestSpotLightTerrain extends SimpleApplication {
         ambLight.setColor(ColorRGBA.Black);
         rootNode.addLight(ambLight);
 
-        cam.setLocation(new Vector3f(-41.219646f, -84.8363f, -171.67267f));
+        cam.setLocation(new Vector3f(-41.219646f, 0.8363f, -171.67267f));
         cam.setRotation(new Quaternion(-0.04562731f, 0.89917684f, -0.09668826f, -0.4243236f));
         sl.setDirection(cam.getDirection());
         sl.setPosition(cam.getLocation());

jme3-terrain/src/main/resources/Common/MatDefs/Terrain/SPTerrainLighting.frag

@@ -150,6 +150,7 @@ varying vec2 texCoord;
 
   vec4 calculateDiffuseBlend(in vec2 texCoord) {
     vec4 alphaBlend   = texture2D( m_AlphaMap, texCoord.xy );
+    vec4 diffuseColor = vec4(1.0);
     
     #ifdef ALPHAMAP_1
       vec4 alphaBlend1   = texture2D( m_AlphaMap_1, texCoord.xy );
@@ -157,9 +158,10 @@ varying vec2 texCoord;
     #ifdef ALPHAMAP_2
       vec4 alphaBlend2   = texture2D( m_AlphaMap_2, texCoord.xy );
     #endif
-
-    vec4 diffuseColor = texture2D(m_DiffuseMap, texCoord * m_DiffuseMap_0_scale);
-    diffuseColor *= alphaBlend.r;
+    #ifdef DIFFUSEMAP
+        diffuseColor = texture2D(m_DiffuseMap, texCoord * m_DiffuseMap_0_scale);
+        diffuseColor *= alphaBlend.r;
+    #endif
     #ifdef DIFFUSEMAP_1
         vec4 diffuseColor1 = texture2D(m_DiffuseMap_1, texCoord * m_DiffuseMap_1_scale);
         diffuseColor = mix( diffuseColor, diffuseColor1, alphaBlend.g );

jme3-terrain/src/main/resources/Common/MatDefs/Terrain/TerrainLighting.frag

@@ -151,6 +151,7 @@ varying vec3 lightVec;
 
   vec4 calculateDiffuseBlend(in vec2 texCoord) {
     vec4 alphaBlend   = texture2D( m_AlphaMap, texCoord.xy );
+    vec4 diffuseColor = vec4(1.0);
     
     #ifdef ALPHAMAP_1
       vec4 alphaBlend1   = texture2D( m_AlphaMap_1, texCoord.xy );
@@ -158,9 +159,10 @@ varying vec3 lightVec;
     #ifdef ALPHAMAP_2
       vec4 alphaBlend2   = texture2D( m_AlphaMap_2, texCoord.xy );
     #endif
-
-    vec4 diffuseColor = texture2D(m_DiffuseMap, texCoord * m_DiffuseMap_0_scale);
-    diffuseColor *= alphaBlend.r;
+    #ifdef DIFFUSEMAP
+        diffuseColor = texture2D(m_DiffuseMap, texCoord * m_DiffuseMap_0_scale);
+        diffuseColor *= alphaBlend.r;
+    #endif
     #ifdef DIFFUSEMAP_1
         vec4 diffuseColor1 = texture2D(m_DiffuseMap_1, texCoord * m_DiffuseMap_1_scale);
         diffuseColor = mix( diffuseColor, diffuseColor1, alphaBlend.g );

jme3-terrain/src/main/resources/Common/MatDefs/Terrain/TerrainLighting.j3md

@@ -272,29 +272,7 @@ MaterialDef Terrain Lighting {
 
     }
 
-    Technique GBuf {
 
-        VertexShader GLSL100:   Common/MatDefs/Light/GBuf.vert
-        FragmentShader GLSL100: Common/MatDefs/Light/GBuf.frag
-
-        WorldParameters {
-            WorldViewProjectionMatrix
-            WorldMatrix
-        }
-
-        Defines {
-            VERTEX_COLOR : UseVertexColor
-            MATERIAL_COLORS : UseMaterialColors
-            V_TANGENT : VTangent
-            MINNAERT  : Minnaert
-            WARDISO   : WardIso
-
-            DIFFUSEMAP : DiffuseMap
-            NORMALMAP : NormalMap
-            SPECULARMAP : SpecularMap
-            PARALLAXMAP : ParallaxMap
-        }
-    }
 
     Technique Glow {