Is it possible to hide objects behind an invisible wall? (cull mask)

hoot_avi

I'm trying to obscure a ball behind a wall, but I have a cull mask enabled. So the camera doesn't see that the ball is behind the wall. Is there a proper way to achieve this?

Edit: I can provide images/clarification if need be. For context, I'm trying to make a game styled after 3D Ultra Minigolf, so I'm trying to occlude a golf ball behind a pre-rendered image.

cybereality

If you want to hide the entire ball that is easy. You could use a ray cast of the visibility notifier. For partial occlusion, it is more difficult. You'd likely need to use a shader for that.

cybereality

If you have a pre-rendered image, you'd need to render a depth map from Blender and then bring that in as a texture to Godot. Then you'd use a depth write to inject the pre-rendered depth into the buffer. I haven't tried this, but it should be possible. Then you need a full screen shader (such as on a ColorRect) to composite the image. I believe this is what they did for the original Resident Evil.

hoot_avi

@cybereality said: If you have a pre-rendered image, you'd need to render a depth map from Blender and then bring that in as a texture to Godot. Then you'd use a depth write to inject the pre-rendered depth into the buffer. I haven't tried this, but it should be possible. Then you need a full screen shader (such as on a ColorRect) to composite the image. I believe this is what they did for the original Resident Evil.

This just sparked several ideas to test out. Thanks so much!

hoot_avi

If anyone finds this thread in the future: I found a more versatile system that works thanks to user LukeH over on the Godot Engine FAQs. Apply this shader material to all your meshes, and it'll ONLY output to the z-buffer. So it has the same effect as manually writing to the z-buffer, but you can re-arrange the meshes if need be.

shader_type spatial;
render_mode blend_mix,depth_draw_always,cull_back,diffuse_burley,specular_schlick_ggx,unshaded;

void fragment() {
    DEPTH = 1.0;
}