More tweaking + UI for the correction stuff

shaders/chunks/raymarcher.glsl

@@ -8,6 +8,7 @@ layout( location = 4 ) uniform vec3 u_CamUp;
 layout( location = 5 ) uniform float u_NearPlane;
 layout( location = 6 ) uniform vec4 u_Render;
 layout( location = 7 ) uniform float u_FogAttenuation;
+layout( location = 8 ) uniform int u_Correction;
 
 layout( location = 0 ) out vec3 o_Color;
 layout( location = 1 ) out float o_Z;

shaders/scene.f.glsl

@@ -58,8 +58,8 @@ vec2 RM_Map( vec3 pos )
 		sin( 1 ) , cos( 1 ) );
 	return vec2( mix( box( q , vec3( 1.5 ) ) ,
 				length( q ) - 1.5 ,
-				.5 ) ,
-			step( 0. , 1.9 - length( pos.xy ) ) );
+				.35 ) ,
+			step( 0. , 3 - length( pos.xy ) ) );
 }
 
 
@@ -105,7 +105,7 @@ void main( )
 	if ( r.y >= 0. ) {
 		const vec3 hitPos = RM_ReduceDiscontinuity(
 				u_CamPos , rayDir , r.x ,
-				tanPhi , 10 );
+				tanPhi , u_Correction );
 		const vec3 normal = RM_GetNormal( hitPos );
 
 		const int midx = int( r.y );