Minimize false depth intersections

Clamps depth with 'real' depth. Fixes #18

godot/Shaders/water_3d.shader

@@ -29,11 +29,16 @@ void vertex() {
 void fragment() {
 	vec2 uv = SCREEN_UV + (texture(refraction_noise, UV + (TIME * movement_direction) * refraction_speed).rg * 2.0 - 1.0) * refraction_strength;
 
+	float real_depth = texture(DEPTH_TEXTURE, SCREEN_UV).r * 2.0 - 1.0;
+	real_depth = PROJECTION_MATRIX[3][2] / (real_depth + PROJECTION_MATRIX[2][2]) + VERTEX.z;
+
 	//Get the raw linear depth from the depth texture into a  [-1, 1] range
 	float depth = texture(DEPTH_TEXTURE, uv).r * 2.0 - 1.0;
 	//Recreate linear depth of the intersecting geometry using projection matrix, and subtract the vertex of the sphere
 	depth = PROJECTION_MATRIX[3][2] / (depth + PROJECTION_MATRIX[2][2]) + VERTEX.z;
 
+	depth = max(depth, real_depth);
+
 	float intersection = clamp(depth / foam_amount, 0, 1) * foam_cutoff;
 
 	vec4 out_color = mix(shallow_color, deep_color, clamp((depth / depth_distance), 0, 1));

godot/project.godot

@@ -104,5 +104,5 @@ jump={
 quality/2d/use_pixel_snap=true
 quality/shadows/filter_mode=2
 quality/reflections/irradiance_max_size=2048
-quality/filters/msaa=3
+quality/filters/msaa=2
 environment/default_environment="res://default_env.tres"