Questions tagged [vertex-arrays]
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46 questions
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What is a efficient way for adding and removing vertices and indices in C++?
So I have this middle-large mesh that is composed from vertices and respective indices. At some point I need to add new ones and remove some. But that brings me into trouble. Because if I have, for ...
- 506
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111
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Tell if two polygons are colliding
I want to make a function like areColliding which takes two polygons as args.
I also want to cover cases like
and the dreaded
because I am trying to create a ...
user149847
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768
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OpenGL VAO buffer rebinding vs binding switching
I'm considering two different approaches to vertex buffer management in my OpenGL game engine. The first one seems to be pretty usual, but I haven't seen the second one being proposed or used anywhere....
- 111
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VAO and VBO connection and granularity with multiple objects
How general should vertex array objects be?
I'd like to plan ahead and avoid a major revision down the road. I'm having a hard time wrapping my head around a few (possibly conflicting) pieces of ...
- 123
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SFML 2.4's RectangleShape is running slow when rendered multiple times
I am creating a level for my game and currently, there is a Tile class where I have a black RectangleShape rendering without any weirdness, except when I look at the FPS, its 200. Now, I have a pretty ...
- 11
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407
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What to do with unused vertices?
Imagine yourself a vertex array in OpenGL representing blocks in a platform game.
But some vertices may be not used.
The environment is dynamic, so there always some vertex may suddenly become ...
- 151
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445
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Streaming to VAO VertexBuffer using OpenGL Direct State Access for Instancing
How do i stream to a vertex buffer using Direct State Access? I want to update my vertex buffer of matrices every frame so i can use it in my Shader.
This is how i specify my buffer. I do this once ...
- 145
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823
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In game engine, how to get the vertices buffers of different vertex formats for render from the mesh file properly?
I'm a fresher on engine programming. I have a question of how we can get the vertices buffers of vertex formats from the mesh file.
For example, in OBJ file or FBX file, we save the positions, ...
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7k
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GL_INVALID_OPERATION on glBindVertexArray Despite glGenVertexArrays()
so I've been trying to create a simpler way to draw polygons and and have come across the following issue:
When I call glBindVertexArray(m_VAO); it throws a ...
- 352
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247
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How to combine VAO and shader language?
I'm new and trying to draw a very simple quad with VAO and GLSL.
My definitions:
...
- 117
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363
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What data to store along a vertex
Is there any other recommended data I should store in the vertex buffers aside from a vertex' coordinates, normals and texture coordinates?
For example data I'd need for a feature that almost every ...
- 125
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Loading Wavefront Data into VAO and Render It
I have successfully loaded a triangulated Wavefront (.obj) into 6 vectors, the first 3 vectors contain the locations for vertices, UV coords, and normals. The last three have the indices stored for ...
- 208
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697
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Does interleaving in VBOs speed up performance when using VAOs
You usually get a speed up when you use interleaved VBOs instead of using multiple VBOs. Is this also valid when using VAOs?
Because it's much more convenient to have a VBO for the positions, and one ...
- 247
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1
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379
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OpenGL Transform Feedback output size
I'm working on a particle system using transform feedback, and I would like to know if it is possible to render to anything other than floats, like halfs, using Transform Feedback (OpenGL 3.3)? It ...
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214
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XNA Game arhitecture, sharing vertices between objects
I'm practicing primitives rendering in XNA and I want to create something like pipe or tunnel.
I have base class called PipeSegment from which I inherit classes like RotatingSegment and NormalSegment (...
- 137
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1k
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Per Instance Textures, and Vertex And Pixel Shaders?
How do you implement per instance textures, vertex shaders, and pixel shaders?
Given:
1. Two different model templates in Vertex Buffer, Square & Triangle
2. Instance Buffer with [n] instances of ...
- 235
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958
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OpenGL ES 2.0 - How to batch draw particles that have unique translations, rotations, scales, and alphas?
I've combined all of my vertex data for many particles into a single array. How would I batch draw all of those particles in a manner that preserves their unique translations?
Any code examples ...
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0
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1k
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Lighting with VBO
INTRO
I'm using a Java JOGL wrapper called processing.org and I have coded some environment on it and I'm quite proud of it even if it has some library stuff that I didn't know anything about it (==...
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3
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3k
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What is a better abstraction layer for D3D9 and OpenGL vertex data management?
My rendering code has always been OpenGL. I now need to support a platform that does not have OpenGL, so I have to add an abstraction layer that wraps OpenGL and Direct3D 9. I will support Direct3D 11 ...
- 24k
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how can I specify interleaved vertex attributes and vertex indices
I'm writing a generic ShaderProgram class that compiles a set of Shader objects, passes args to the shader (like vertex position, vertex normal, tex coords etc), then links the shader components into ...
user3643
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2
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Using index arrays with OpenGL VBOs
I've recently started reading about VBOs.
If, for example, I want to draw a cube using VBOs, can I use one VBO to hold the coordinates for the 8 vertices, and another one as an index array, to ...
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3
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3k
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How to create per-vertex normals when reusing vertex data?
I am displaying a cube using a vertex buffer object (gl.ELEMENT_ARRAY_BUFFER). This allows me to specify vertex indicies, rather than having duplicate vertexes. In the case of displaying a simple cube,...
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