fix ssao

res/shaders/background.glslf

@@ -7,7 +7,7 @@ uniform samplerCube u_skybox;
 
 void main(){
     vec3 dir = normalize(v_coord);
-    f_position = vec4(0.0, 0.0, 0.0, 0.0);
+    f_position = vec4(0.0, 0.0, -1e9, 1.0);
     f_normal = vec4(0.0);
     f_color = texture(u_skybox, dir);
 }

res/shaders/effects/ssao.glsl

@@ -1,6 +1,6 @@
 #param vec3 u_ssaoSamples[64]
 #param int u_kernelSize = 16
-#param float u_radius = 0.2
+#param float u_radius = 0.4
 #param float u_bias = 0.006
 
 vec4 effect() {
@@ -32,5 +32,5 @@ vec4 effect() {
 
     float z = -position.z * 0.01;
     z = max(0.0, 1.0 - z);
-    return vec4(occlusion, 0.0, 0.0, 1.0);
+    return vec4(mix(1.0, occlusion, z), 0.0, 0.0, 1.0);
 }