add 'u_alphaClip' to entity shader

res/shaders/entity.glslf

@@ -9,6 +9,7 @@ uniform samplerCube u_cubemap;
 uniform vec3 u_fogColor;
 uniform float u_fogFactor;
 uniform float u_fogCurve;
+uniform bool u_alphaClip;
 
 void main() {
     vec3 fogColor = texture(u_cubemap, a_dir).rgb;
@@ -16,7 +17,7 @@ void main() {
     float depth = (a_distance/256.0);
     float alpha = a_color.a * tex_color.a;
     // anyway it's any alpha-test alternative required
-    if (alpha < 0.5f)
+    if (alpha < (u_alphaClip ? 0.5f : 0.2f))
         discard;
     f_color = mix(a_color * tex_color, vec4(fogColor,1.0), 
               min(1.0, pow(depth*u_fogFactor, u_fogCurve)));

src/graphics/render/WorldRenderer.cpp

@@ -153,6 +153,7 @@ void WorldRenderer::renderLevel(
         frustumCulling->update(camera.getProjView());
     }
 
+    entityShader.uniform1i("u_alphaClip", true);
     level.entities->render(
         assets,
         *modelBatch,