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Questions tagged [culling]

The process of determining whether an object should be rendered in a scene.

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1answer
21 views

Face culling all faces that cannot be seen [duplicate]

I'm working on a simple 3d game using the Processing Java environment. I want to optimise my code so I can draw many many 'objects' (the world is made up of many different shaped objects that live ...
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1answer
12 views

Culling mask don't work

I have the following setup: MainCamera render everything except ImageTurret layer. TurretCamera render only ImageTurret layer on a RawImage My problem is: MainCamera render everything and ...
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0answers
37 views

Prevent near-plane culling in vertex shader

I am rendering a non-sphere light mesh and the standard question is how to cull: cull front faces and you loose Z-Testing benefits, cull back and you get into situations where camera is not rendering ...
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0answers
211 views

Unity : Orthographic Camera is not Occlusion Culling?

In the scene where the occlusion culling is done as desired, When I change the camera to orthograhpic, occlusion culling is not done. (Look at the sphere the red arrow points to on the right) What ...
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2answers
54 views

What methods are there to discard points on one side of a surface but not the other?

Goal: Given a surface mesh (terrain), discard all points above a given elevation relative to the terrain. The terrain can change quite often due to tiling and LODs, so the point culling will need to ...
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1answer
106 views

Unity, manual culling

Is there a way to for example in vertex shader cull current vertex? I have my own grass system and I would like to cull straws that are further away than some distance but I can't use camera culling ...
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1answer
215 views

Spotlight Culling. Plane vs Cone Shape

I am building forward + engine based off of partially http://www.humus.name/Articles/PracticalClusteredShading.pdf If you go to page 36 on the pdf and "spot light culling section" they mention "Do ...
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1answer
149 views

Libgdx OrthographicCamera culling problem with zooming

When I set zoom on an orthographic camera to anything above 1 I get a strange black border on the bottom of the screen. I suspect that this might be some sort of culling problem. I use a viewport to ...
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1answer
737 views

DirectX 11 Predication(Occlusion culling)

Right now I'm using Predication to cull my BV tree after I first cull it with a few different view frustums, to get different ranges of objects to pass on to other parts of the engine. Life is good it ...
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1answer
65 views

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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1answer
158 views

Z buffer for large vs small objects

Are there common, tried and tested techniques for making sure that when displaying very large and very small objects, in a 3D environment, those objects don't display in front or behind each other? ...
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2answers
308 views

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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1answer
370 views

Problem with Frustum Culling Right-Handed(LookAtRH GLM)

I am trying to do Frustum Culling based on Goemetric Approach, however don't matter how much i try, the frustrum rotate to opposite side, i tried to find a solution over all internet, but couldn't ...
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1answer
859 views

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 ...
4
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1answer
860 views

An invisible object that deletes anything behind it?

I am using augmented reality to put a 3D object on top of a "camera detected" object. The 3D object can be though of as leaves that go above the real world object but also fall in front / behind / on ...
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1answer
575 views

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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1answer
291 views

How to manage loads and memory usage and process in unity

I want to know whether level and scene management for memory and process management is handled by Unity, or if the developer has to handle these kinds of concerns. For example, imagine you want to ...
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1answer
854 views

Opengl occlusion culling huge performance drop

Hello I tried to implement occlusiong culling to my engine in opengl using java & lwjgl. Occlusion works but... performance drop is huge I mean from 60-70 fps to 3-6 fps. Here is my question what ...
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4answers
127 views

If a 3d surface is occluded by another 3d surface, does this have any effect on the performance and rendering speed?

We have a 3D character who is wearing a gauntlet on his forearm and visibility of which can be turned on and off. Would it be better to create two versions of arm, one without extra triangles that are ...
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0answers
222 views

Front Face Culling with Shadowmapping

To avoid shadow acne I usualy use front face culling which works great. But for my current implementation the mesh is a quite complex terrain (depending on the lod level) and than the shading (dot ...
3
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1answer
1k views

The better performance in occlusion culling, plane or quad?

In the above picture, when the left camera shows two small parts of the quad, all of that is rendered (it can be a very large quad). But in the right one only two small parts of it is rendered. Which ...
5
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1answer
2k views

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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1answer
131 views

Partial mesh culling by checking against the AABB-tree of objects vertices instead of only the AABB of the whole objects

First thing: this is more of a conceptual question than an implementation oriented one, but still tips about implementation will be very much welcome if you happen to have any (athough I have some ...
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1answer
1k views

Is Frustum culling still needed today?

I'm reading about efficient Frustum culling algorithms. I found an article about a smart method that first use the Frustum AABB (Axis Aligned Bounding Box) to eliminate most of the scene before check ...
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1answer
369 views

Making certain GameObjects visible for a camera

I have 2 cameras in my 2D game. One displays gameobjects normally, and the other camera draws some of these gameobjects reflected (scale.y *= -1). The reflected camera would draw only objects in the "...
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1answer
111 views

How does hidden surface removal work?

Lately, I've been learning some OpenGL for fun, and I've been thinking about hidden surface removal. Say you have a high poly count static scene, with nothing that moves, no bones, physics, etc. Just ...
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0answers
17 views

CanDraw in large hierarchical scene with rotation

I've been assigned to write small simulation visualization, that contains thousands of cubes (I know you heard that before). Now I'm working on optimization of stuff that takes place there, but ...
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1answer
65 views

Determine whether an object is 'visible' at a given distance automatically?

I am creating an environment using procedural content. To optimise performance, I am batching small meshes ahead of time. For efficiency's sake, I don't want to batch objects that make only an ...
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2answers
144 views

back-face (back-line) culling without winding order

In fooling around with my own 3D display engine I've been able to get a few modest features working, and I've come close with this latest one - line culling - but I fear in order to do it correctly I'...
2
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2answers
394 views

Traditional Chunk Loading vs. Chunk Swapping

I'm designing a voxel-based game (aren't we all?), and just yesterday implemented infinite terrain generation. I'd already had the terrain generation working off of simplex noise, so this wasn't a ...
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1answer
441 views

Ambient occlusion: Correct culling after anisotropy correction

I've added simple color based ambient occlusion to my game. First it looked like this (from giawa.com): The description: "Due to anisotropy, the ambient occlusion shading on the top left is ...
4
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0answers
376 views

Compute directional light frustum from view furstum points and light direction

I'm working on a friends engine project and my task is to construct a new frustum from the light direction that overlaps the view frustum and possible shadow casters. The project already has a ...
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0answers
179 views

Frustum culling - error evaluating a point in the plane of the frustum

I am trying to implement the following code: http://www.lighthouse3d.com/tutorials/view-frustum-culling/geometric-approach-implementation/ I need to use frustum culling in my graphics engine. my ...
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0answers
29 views

Manual occlusion culling with glDrawElements [duplicate]

How should I go about doing occlusion culling with glDrawElements? I am dealing with voxel-like terrain. I want to avoid drawing the faces that are facing another ...
1
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1answer
308 views

Frustum culling vs draw calls

In a more performance-sensitive environment than a desktop CPU/GPU (namely a mobile device) is there really a point in determining whether or not to skip drawing non-visible objects vs reducing the ...
2
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1answer
1k views

Given face normal and vertices of a triangle, how to find the acyclic order of vertices?

I'm in the process of constructing a custom 3D triangle mesh. I found the vertices of the triangle in the 3D space and it's face normal. How do I find the acyclic order of vertices? If I draw the ...
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1answer
205 views

Which parts to draw in an infinite world?

I have an infinite world (from Perlin Noise). The world is generated in sectors that are that are big cubes (each with a random colour, in the image above; my sectors are 10x10x10). I'm currently ...
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0answers
358 views

Incorrect frustum culling with center/half-size AABB

I'm trying to implement an axis-aligned bounding box with center/half-size instead of min/max. And I have some problems when it comes to create a method to detect if the aabb is visible or not. I try ...
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1answer
141 views

A quick question about culling

So I have some vertices that I'm drawing with XNA and the issue I had ages ago was that they weren't appearing when the camera was placed above them. By turning on backface culling this fixed it, but ...
2
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1answer
670 views

Frustum culling with third person camera

I have a third person camera that contains two matrices: view and projection, and two Vector3's: camPosition and camTarget. I've read up on frustum culling and it makes it seem easy enough for a first ...
6
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3answers
3k views

State of the art Culling and Batching techniques in rendering [closed]

I'm currently working with upgrading and restructuring an OpenGL render engine. The engine is used for visualising large scenes of architectural data (buildings with interior), and the amount of ...
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1answer
1k views

How to get pixels affected by a light in deferred shading?

I implemented deferred rendering in my little engine using framebuffers but there is no dynamic lighting for now. The g-buffer contains positions and normals in view space and albedo. To implement ...
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0answers
100 views

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 ...
1
vote
1answer
1k views

Creating a frustum for culling in world-space glm matrices

I need to do frustum culling where the bounding boxes are in world-space to determine which entities get to be updated/drawn. I was trying to use the classic projection/view matrix plane extraction ...
19
votes
3answers
2k views

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 ...
4
votes
1answer
204 views

Forcing early-z with raytracing

I'm working on a GLSL raytracer, and I need to be able to edit gl_FragDepth in the FS. However, doing so disables early-z culling. The scene is rendered front-to-back and the FS can only push points ...
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1answer
849 views

backface culling error (in world space)

I write simple software renderer. In my pipeline I have stage of backface culling. But looks like it has some error. I perform culling right after world transformation (is it correct?). ...
3
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2answers
269 views

XNA Sprite Clipping Incorrectly During Rotation

I'm having a bit of trouble getting my sprites in XNA to draw when near the edge of the screen. Seemingly if you use SpriteBatch to draw then XNA will not draw it if for example (mPosition.X + ...
3
votes
1answer
133 views

If I use my own normal values, should I turn off winding order culling?

I've discovered that I managed to program a series of boxes with indexed vertices in such a way that every other triangle (Half of each face) has a backwards winding order. As a result, XNA is ...
8
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4answers
2k views

Efficiently culling off-screen objects on a top-down 2D map

I know efficiency is key in game programming and I've had some experiences with rendering a "map" earlier but probably not in the best of ways. For a 2D TopDown game: (simply render the textures/...