Tweak the default SpatialMaterial properties

Roughness is now set to 1 by default and albedo is now white,
even on meshes that do not have any materials defined.

This means there is no longer a visual difference between a
mesh with no materials defined and a mesh with a default
SpatialMaterial defined.

drivers/gles2/shaders/scene.glsl

@@ -473,17 +473,17 @@ void main()
 {
 
 	highp vec3 vertex = vertex_interp;
-	vec3 albedo = vec3(0.8, 0.8, 0.8);
+	vec3 albedo = vec3(1.0);
 	vec3 transmission = vec3(0.0);
 	float metallic = 0.0;
 	float specular = 0.5;
-	vec3 emission = vec3(0.0, 0.0, 0.0);
+	vec3 emission = vec3(0.0);
 	float roughness = 1.0;
 	float rim = 0.0;
 	float rim_tint = 0.0;
 	float clearcoat = 0.0;
 	float clearcoat_gloss = 0.0;
-	float anisotropy = 1.0;
+	float anisotropy = 0.0;
 	vec2 anisotropy_flow = vec2(1.0, 0.0);
 
 	float alpha = 1.0;

drivers/gles3/shaders/scene.glsl

@@ -339,7 +339,7 @@ void main() {
 #endif
 #endif
 
-	float roughness=0.0;
+	float roughness = 1.0;
 
 //defines that make writing custom shaders easier
 #define projection_matrix local_projection
@@ -1608,17 +1608,17 @@ void main() {
 
 	//lay out everything, whathever is unused is optimized away anyway
 	highp vec3 vertex = vertex_interp;
-	vec3 albedo = vec3(0.8,0.8,0.8);
+	vec3 albedo = vec3(1.0);
 	vec3 transmission = vec3(0.0);
 	float metallic = 0.0;
 	float specular = 0.5;
-	vec3 emission = vec3(0.0,0.0,0.0);
+	vec3 emission = vec3(0.0);
 	float roughness = 1.0;
 	float rim = 0.0;
 	float rim_tint = 0.0;
 	float clearcoat = 0.0;
 	float clearcoat_gloss = 0.0;
-	float anisotropy = 1.0;
+	float anisotropy = 0.0;
 	vec2 anisotropy_flow = vec2(1.0, 0.0);
 
 #if defined(ENABLE_AO)

scene/resources/material.cpp

@@ -2106,10 +2106,10 @@ void SpatialMaterial::_bind_methods() {
 SpatialMaterial::SpatialMaterial() :
 		element(this) {
 
-	//initialize to right values
+	// Initialize to the same values as the shader
 	set_albedo(Color(1.0, 1.0, 1.0, 1.0));
 	set_specular(0.5);
-	set_roughness(0.0);
+	set_roughness(1.0);
 	set_metallic(0.0);
 	set_emission(Color(0, 0, 0));
 	set_emission_energy(1.0);