Questions tagged [occlusion]
The occlusion tag has no usage guidance.
36 questions
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How to load landscape far away in the level, while not loading things I shouldn't be able to see?
My landscape is invisible after a certain distance away from the player when I use world partition in Unreal Engine 5.4. How can I make it so that the landscape is visible when it should be visible to ...
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What does 'being conservative' mean in occlusion culling?
I've been learning graphics engine recently and I come across a term - conservative:
The CPU-GPU sync point problem Unreal solves like any other engine that uses queries, by deferring reading the ...
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How to compute visible area of a sphere
I have a number of spheres in my scene. I also have another object that I want to scale depending on the amount of a selected sphere that is visible (it can be occluded by multiple other spheres ...
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Determine if a static mesh is lit by directional light
I want to determine if a mesh is lit by the directional light on my scene in editor to automatically disable its "dynamic shadow casting" property (let's say I have one light source in my ...
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Occluding spawned object behind obstacles in AR/MR
I have spawned the object in Unity AR foundation and as expected, the object is always in front of the actual world objects.
So if I spawn cube under the table and look from above, the cube is going ...
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Find out triangles that are not occluded from a camera view?
For a project i need to find out triangles that are directly seen by the camera / user. Triangles that are occluded by other triangles should be ignored. There may be 200 thousand triangles in a model,...
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Fast Occlusion Discovery in 3D Point Cloud
I am trying to find occluded objects given a view point at x,y,z in the scene. For instance in the example below all the points constructing trees should be ...
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Collider inside another collider: Move the brain via mouse while being able the click the spheres
The spheres have a sphere collider on them and are clickable via this script:Clickable.cs
...
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Calculate occluded parts for planet like object
So I have camera position (it's dynamic), planet position (also dynamic), radius and coordinates for every side (node) corners and I want to hide side that is beyond horizon (with some safety margins)....
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Orthographic Camera is not Occlusion Culling?
In the scene where the occlusion culling is done as desired,
When I change the camera to orthographic, occlusion culling is not done.
(Look at the sphere the red arrow points to on the right)
What ...
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Is this Code saving performance ? It is kind of a Occlusion Culling
I wanted to do Occlusion Culling on my Scene but I just get a bunch of Errors like "Couldn't load geometry..." etc. I tried to do like another way but the same thing, the Occlusion Culling just ...
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Occlusion culling of BV tree nodes behind terrain
So I have a bounding volume tree, almost an octree but not quite.
Anyway I'm trying to optimize my drawing, right now I have a few different culling frustums that I use to cull different ranges of ...
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Unity 5 - Occlusion culling at runtime
I am creating a game in Unity where the game is rendered while playing. The game is made in a voxel style, and has thousands upon thousands of objects rendered while playing. Of course, this causes a ...
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Why I get inconsistent occlusion query results?
My system: Catalyst 15.12, mesa 11.2.1, Archlinux, kernel 4.5.1
Depending on camera position I get inconsistent occlusion query results. Following scene contains wall, objects behind wall and ...
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Unity - Check if sprite is within range around player
I need to know if a sprite is within range (circle or square doesn't matter) around the player. If the sprite is, let's say, 100 blocks away from the player, I will disable it. This wouldn't be too ...
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Unity 5 - Occlusion culling 2D error
I'm trying to set a Occlusion culling on my topdown 2D game. I have made a sprite object with a Occlusion Area on it.Once I try to bake it, it gives me the following error:
No Renderers that are ...
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Moving occluders in Unity?
I've made a shader for a racing game in Unity that billboards a headlight glow effect (the lights are not actually light sources so I can't use lens flares). The quad with the glow texture is rotated ...
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Image-Space coherence of the z-buffer algorithm
I'm reading Hierarchical z-Buffer Visibility by Ned Greene et al. and they state that
traditional Z buffering makes reasonably good use of image-space coherence in the course of scan conversion.
I ...
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Hierachical Z-Buffering for occlusion culling
I'm reading the Occlusion Culling section in Real-Time Rendering 3rd Edition and I couldn't understand how it works. Some questions:
How does having a "Z-pyramid" contribute? Why do we need multiple ...
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How do I query a LibGDX Box2DLights "light" and "dark" regions?
I have lighting implemented using Box2dLight. I want to update/render things inside the player's PointLight area. Stuff in the dark area should not be rendered.
How can I find which areas are lit or ...
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Ambient occlusion of cubes, a specific case
After much fiddling around and thinking I've got my AO working on my game engine as intended; except one specific case.
When a block is nestled between others on two sides, but the corner block is ...
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Different bounding volumes for culling and collision detection
Should an object in a 3D-engine use different bounding volumes for collision-detection (broad-phase) and culling?
Basically class renderBounds and ...
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How do I avoid an infinite loop when testing D3D9 occlusion queries in SlimDX?
I'm creating a Managed DirectX 9 application using SlimDX. I'm trying to utilize occlusion queries in order to cull non-visible geometry found in the scene. The problem I'm having relates to SlimDX's ...
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Shader that "cuts" hole through all geometry
How can I create a shader that "cuts" through all geometry, only rendering the clearing background in Unity? An example:
That's a prism in a huge white box-shaped room. The surface of the prism is ...
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Self occluding object and alpha blending
Look at the object I've rendered with my app:
It's the same screen twice, above the original and below I've drawn (by hand :P) the shape of the mesh of one of plant's leaves. You can clearly see ...
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345
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Calculation: Is a sphere/square/plane visible from a certain point?
I'm searching for a way to detect if a form (shape can be changed if algorithm requires it) is visible from a single point in a 3D tile-based world. This should be used as some kind of wall-hack ...
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OcclusionQuery: how to ignore some objects?
I'm trying to make a LensFlare effect when the player watch the sun in my XNA 4.0 Game.
To do this, I use OcclusionQuery, here's my code:
http://pastebin.com/meAkdwmD
I also have some models, a ...
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calculating occlusion in cube voxel engine
This is more a conceptional (approach) question then the search for an implemented solution, since I was unable to find proper hints via google or similar.
The problem is as follows:
Given you have ...
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iSGL3D Occlusion Culling
I was testing a cool 3D Scene Graph Library called iSGL3D. Since I found some functions called alpha culling for displaying partly hidden objects (making the ones in front transparent). I was ...
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How to occlude lights in Unity3D?
First off, I own Unity Pro.
I've been looking in to occluding lights when they aren't being viewed for a while now to improve performance. The main methods I ran in to were using BecameVisible() and ...
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In modern AAA games with open environment and lot of static content (eg : crysis), how is occlusion culling performed?
Two ideas i have in mind :
1) Scene is rendered to a invisible buffer, using low resolution and low polygon count models (or even using only bounding volumes like cubes or spheres). The buffer is ...
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How does pixel shading work for ambient occlusion volumes?
I'm trying to understand the ambient occlusion technique described here, but I've trouble comprehending what exactly is the pixel shader doing.
Is the pixel shader invoked on points that belong to ...
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Extracting Frustum Planes (Hartmann & Gribbs method)
I have been grappling with the Hartmann/Gribbs method of extracting the Frustum planes for some time now, with little success. There doesn't appear to be a "definitive" topic or tutorial ...
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Unity Occlusion Portals: What and How?
(Here I eat my words on Meta about posting Unity questions on Unity Answers... since that site is less responsive than this one.)
Unity provides cell-based Occlusion Culling (via Umbra, I believe). ...
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Partial recalculation of visibility on a 2D uniform grid
Problem
Imagine that we have a 2D uniform grid of dimensions N x N. For this grid we have also pre-computed a visibility look-up table, e.g. with DDA, which answers the boolean query is cell X visible ...
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Dealing with occlusion in an isometric sandbox game
Imagine a 3D sandbox game like Minecraft with third-person isometric graphics. If the camera only moves in two dimensions, and doesn't rotate, then a large portion of the world will always be occluded ...
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