Questions tagged [scene-graph]
a data structure that arranges the elements of a scene into a logical representation
76 questions
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Octree Query - Frustum Search and Recursive Vector Inserts
Brief
I have spent probably the last year thinking about implementing an Octree data structure into my C++ game engine project for scene management and frustum culling of lights and meshes. Right now ...
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When/Where to use Node2d as parent vs Other Node
tl;dr = When/Where/Why use 'Node2d' as the parent vs going straight to 'Other Node'?
I have just started diving into using Godot for the first time. I completed the Your First Game official tutorial (...
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Hierarchical relationships in an Entity Component System
I'm trying to figure out how to integrate entity component systems with scene graphs in a web game / application. The problem is of course that ECS and scene graphs are very different in nature. They ...
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Calculating child world translation, rotation and scale
I'd like to know if it's possible to calculate a child's world translation, rotation and scale individually. I'm used to seeing devs resorting to matrix multiplication and then decomposition, like so:
...
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Parallel transformations tree update
I create my own pet-project graphics engine for the learning and research purposes.
Now I'm trying to create a more efficient scene transformations update technique. My current approach is the linear ...
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Scene graph or just plain container?
I'm trying to understand if it makes sense to call what I have a scene graph or not.
Im doing an asteroid-like game, where all objects in the game are described in world space coordinates (an ...
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Inverse transformation matrix for checking whether a point is inside a rect
I'm trying to determine which nodes in my scene graph contain a given point in global coordinate space, using the inverse of the node's global transformation matrices.
Here's a simplified version of ...
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Can I have a scene graph translation node with multiple parent nodes?
I am trying to write a C++ scene graph structure. While designing the node classes I am facing the below issue.
I have a scene graph to represent a house.
I would like to have another house next to ...
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Determine view-matrix with camera placed in a scene graph
My scene is organized with a simple scene graph where the child multiplies its transformation with the one of the parent.
For normal objects, likes meshes, this works as expected, but I also want to ...
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How to use nodes in scene graph for game logic
I am working on a 3D 2048-game using Java with LWJGL to gain some 3D math and OpenGL experience. I built a small scene-graph (GroupNode and Box). My problem is that the tree structure of my scene-...
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SceneNode transform and Eye and Center position
I am learning some inner workings of game engine development and have come across this confusion. To explain what I am trying to do, I want to start with an example:
Let's say that I have an object (...
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Scene components and renderer
I'm currently writing a very small game engine for learning purposes, and hit a block when trying to separate the engine's logic from the "rendering" module.
My current approach is to feed my ...
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How do I rotate an object around another object with an angle and an offset?
I made a small game engine with a hierarchy, but have a with problem with applying transform down the hierarchy. I have an object with a parent, and I want the child to rotate around the parent with ...
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How can I visually see changes made to a scene since the last git commit
I'd like to see the changes made in a scene (.unity file) before I commit them to git.
I have looked into several GIT/Unity solutions but all of them are made for merging changes and not for showing ...
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webgl draw call batching and optimizations
I'm working mostly with three.js and webgl, i have some experience with unity.
I don't consider three.js a game engine, more of a "rendering library" - something that takes care of the GL ...
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Scene with Node graph thread safe, with important efficeny
I will try to be as explicit as I can, and I apologize for my grammar...
I am working on a game engine (specifically on the Render part) and I am facing some conception choice that will involve a lot ...
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SceneGraph in Entity Component System, Transformations
I'm recently learning entity component systems, and started implementing it into my test engine, however I'm having an issue integrating this with scene-graph, which I'm trying for the first time.
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Should a transform class store a matrix or seperate position/rotation/scale values?
I'm creating a transform class to make storing the transform of individual objects in a scene easier, but I'm unsure on how to do it.
I could create one like this:
...
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Code vs. Configuration in Unity [closed]
I know a thing or two about Unity at this point, but I've still lots of subjective, best practice questions, Such as:
How do you decide what values are obtained via Start/Awake initialization, and ...
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Scene node system [closed]
I read Real-Time Rendering and the author explains that scene graphs can be used to propagate "materials" and light sources down the hierarchy, that's cool but it really ends right there. There's no ...
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Everything is a Scene Node?
My perception of scene nodes is that they are just containers for Mesh objects with transformations.
After viewing some open sources graphics APIs (e.g Irrlicht), I noticed they call many not-to-be-...
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How to create a forest game scene in unity3d?
I am pretty new to game development. I have started using unity3d.
I have created simple games for which I have used plane (3d gameObject). Now, I want to move a step forward I want to create a ...
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Cumulative transformation matrices for hierarchical object transformations
I'm having a small issue with my design for hierarchical 3D objects. I'll try to sum things up concisely. Every object has a vector3 for its position, scale, and rotation, as well as a std::vector of ...
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Scene Graph: Does anybody have a real world example?
I'm trying to wrap my head around how scene graphs work, and how to apply that to my game, in the context of all my game objects, including assets, cameras, units, shaders, etc.
All I can find are ...
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World scene graph questions [closed]
I am going through the process of rethinking my current game engine's design. And I'd like to ask about some information from other's experiences about scene graph. Before we begin, this graph is in ...
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How to cache resources in my homebrew rendering system
Background:
I am designing a simple 3D render system for an entity component system type architecture using C++ and OpenGL. The system consists of a renderer and a scene graph. When I finish the ...
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338
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server/client architecture, how to combine physics data, scene graph and database over the network?
I'm writting a C++ server and a C++ client for a rpg game.
The client is using OpenSceneGraph for rendering the 3D. RakNet is used for communication between the client and server.
At this time, the ...
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2
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583
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Updating children nodes in a game engine
I am writing my own small game engine (thin layer based on SDL2) in C++. My base class is Node (contains information on an entity's position, scale, rotation, etc.), And I've got two special ...
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446
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SceneGraph understanding
So far i can understand that it is a tree data structure consisting of multiple nodes.
If i draw an entity in world without any scenegraph, e.g. I have an object "Aircraft" which inherit from ...
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Planar scene graph
Suppose there are many line segments on a plane (2D scene) and I would like to redraw only small portion ("window") of the whole scene. The scene is dynamic, meaning one can add/remove/transform lines....
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Organizing scene graph nodes that have multiple parents
I am trying to understand how, from an abstract sense, scene graphs should be organized.
Say that in a game, there is a scene where the user is inside a house. The house has four walls, and on one ...
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Understanding Scene Graphs and Graph Edges
So I'm trying to getting to grips with using Scene graphs and nodes in my code (game coding in C++) and I think I understand the basics of them and how they are used (and I can definitely see the ...
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Scene2d Stage Actor setup issues
I am creating a game using libgdx.
In the same each level has a class. I have stage as a member variable of the class. To this stage, I add actors.
Inside the levels class, I have attaced the input ...
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How should I organize my Unity scene graph?
In programming, we have coding conventions — self-enforced rules to help maintain order. Does such a convention or consensus exist on how to lay out scenes in Unity?
I've seen two styles of ...
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View frustrum culling
I have a model structured like this:
1. Root model
1.1.Child model 1
1.2 Child model 2
1.3 Child model 3
1.4 .....
The model in question ...
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Dealing with multiple scenes /levels
Overview
I have a scene manager in my game and in each 'Scene' I have a render() and a update() method for drawing and updating my game's logic.
Basically, when I want to switch to another scene, ...
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ConcurrentDictionary as a main container for game objects?
I wonder if it is wise to use ConcurrentDictionary as a main container in a game? That is it will be used to:
update every object inside it in a parallel.Foreach loop;
add (but not remove) objects ...
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Utility of submesh class in a 3d game engine?
I've read somewhere that we use sub mesh for being able to give different materials to one mesh. But why not simply do this with scenegraph ?
I mean you have a car mesh, and instead of using ...
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Scene Graphs and Entity Component Systems
I am trying to determine how to move my current implementation of nodes in a scene graph to an entity component system and am struggling to wrap my head around how the two can work together, if at all....
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Bounding volume hierarchy for outdoor scenes
I started with a very simple graphics engine a few weeks ago and I have finished a simple scene-graph and I am now at a point where I need to create a bounding volume hierarchy.
I never really ...
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How to make child transforms honor parent origin
I'm working on a 2D transform system that has the following requirements:
Transforms can have children
Transforms have anchor points/origins that offset them
Children should honor the parent's ...
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LibGDX Scene2D event handling and bounding box relative to the center of a TextureRegion
I'm experimenting with Scene2D to see if it fits fot the game I want to develop.
Say I have an Actor with the origin in the center of its TextureRegion.
My setup method contains this code:
...
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Using different shaders on the same model at runtime
I've already asked similar but a bit unclear question here but this time I will be very specific and to the point.
Suppose I have an actor which grabs a power up. He starts to glow using bloom shader ...
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Engine Rendering pipeline : Making shaders generic
I am trying to make a 2D game engine using OpenGL ES 2.0 (iOS for now). I've written Application layer in Objective C and a separate self contained RendererGLES20 in C++. No GL specific call is made ...
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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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OpenSceneGraph, multiple instances of a model
Im working on my first project using OpenSceneGraph. The project is a model flight simulator for one of my university courses,
I want to be able to load airplanes (consisting of multiple models) and ...
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Best practise for representing large spaces in a scene graph
I'm attempting to represent a procedurally generated world in a scene graph, specifically in the Jmonkey engine (Jme3). To make this managable I have broken up the world into smaller chunks. Each ...
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OpenWorld SceneGraph management and optimization [closed]
I have a SceneGraph class which for now is just a simple list implementation, and the only optimization I've planned so far is a check is something like this:
...
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Handling Origin/Anchor Points in a Scene Graph
I'm trying to implement a simple scene graph on iOS using GLKit but handling origin/anchor points is giving me fits. The requirements are pretty straightforward:
There is a graph of nodes each with ...
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Rolling my own scene graph
Hello Game Development SE!
I'm crawling my way through OpenGL with the hopes of creating a simple and very lightweight game engine. I view the project as a learning experience that might make a ...
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