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Questions tagged [vertex-buffer]

The tag has no usage guidance.

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0answers
33 views

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....
0
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1answer
36 views

How to use textures in 2D games in WebGL

I have been trying to figure out how to structure the VBOs in WebGL, and think that keeping them all together in one if at all possible sounds like the best approach. Right now I'm thinking of having ...
-1
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1answer
53 views

The types of buffers typically used in robust WebGL/OpenGL apps

I am trying to get a feel for how to structure WebGL/OpenGL apps and have been looking through sources for the types of buffers they use. I've found these: uvs occlusion noise bitangents tangents ...
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0answers
19 views

(C++, DirectX 11, UWP) - How do I update the ByteWidth of a VertexBuffer without recreating it?

I want to have one buffer used for all dynamic properties but the amount of vertices in this could vary from just a few for an interface to the whole scene. As such if it's becomes initialized with ...
0
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1answer
105 views

Unreal 4 - How to access and iterate through the polygons of a mesh?

I'm newbie with Unreal Engine 4. I need to create a function which calculates the volume of a mesh, based on the following example: https://n-e-r-v-o-u-s.com/blog/?p=4415 To achieve that I created ...
-1
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0answers
36 views

Element Buffer Object size for shared VAO

I want to store my indexed geometry in a shared vao. If the current vao is full, I create another vao together with the buffers for the layouts (Pos, Normals, Uvs, etc..). I create them with a ...
0
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1answer
85 views

OpenGL glVertexAttribFormat vs glVertexAttribPointer

I am attempting to change my code from using glVertexAttribPointer to glVertexAttribFormat as I have heard it;s more efficiend ...
1
vote
1answer
221 views

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 ...
8
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2answers
3k views

OpenGL - How come drawing sprites takes so much performance

I'm wondering how drawing simple geometry with textures can eat up so much performance (below 60fps)? Even my good graphics card (GTX 960) can "only" draw up to 1000 sprites smoothly. The textures I'm ...
2
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2answers
184 views

How does OpenGL know which buffer to draw?

I have been trying out some OpenGL things and was wondering something: How does OpenGL know which buffer to draw when glDrawElements is called (since there are ...
0
votes
1answer
81 views

A question about SharpDx Colored Cube

Recently I start to study SharpDx, so I am a newbie for it. I try to create a cube which has difference color on each vertex such as the picture below. However, what I created after my coding is ...
2
votes
1answer
67 views

Can GPU draw from one VB and upload to another VB at the same time? (OpenGL)

We have a working implementation of vertex double buffering, rendering from one buffer and uploading vertex data to next frame buffer at the same time. However I am concerned that CPU spends quite a ...
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0answers
56 views

When should I use auto-managed buffers in LWJGL 3?

LWJGL3 has two methods of creating buffers that I know of: Auto-managed buffers that clean up the buffers automatically using the MemoryStack class, and manually managed buffers that must be manually ...
0
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1answer
38 views

DirectX Assembler Stage, passing same data

I'm having problems with the Input Assembler. The first time the data is passed through the pipeline, everything is fine. But, when the index buffer (with a diffrent/higher index than before) refers ...
0
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0answers
579 views

How to update vertex buffer in DirectX 12

I would like to create cloth simulation. Which type of buffer should i use for vertices. I will need to update them on every frame. And how updates need to be done. I'm new to graphics programming, ...
1
vote
1answer
125 views

Multiple buffers and calling glBufferSubData

Originally asked this on Computer Graphics, but it might fit in better here. In my project, for convenience I would like to use many buffers. Many buffers in my case means 50-100 terrain patches ...
3
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3answers
408 views

DirectX11 - Texturing Terrain Mesh with Shared Vertices

I'm trying to create and texture a terrain mesh in DirectX11. I've managed to create the mesh itself, but I don't know how I should do the texturing. Let me start by explaining what I'm doing so far: ...
0
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1answer
111 views

Data overwritten in MapSubresource() method

I am trying to dynamically update the vertex buffer in a UWP project using SharpDX, once every time I call the following method, where context is the device context member. ...
0
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1answer
152 views

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 ...
2
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1answer
109 views

How do I draw a high-performanced scatter plot

I am new to DirectX and currently I'm trying to use it for data visualization, to be specific, a 3D scatter plot. There are very limited resources on the internet, and I have read part of Frank D Luna'...
1
vote
2answers
171 views

OpenGL: Does it make sense to use an Index Buffer With GL_TRIANGLE_FAN?

When trying to draw circles in webGl (You can answer the question even in openGl terms, I'll understand both), I came across the TRIANGLE_FAN flag when calling either glDrawArrays (with only a vertex ...
0
votes
1answer
355 views

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, ...
0
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2answers
119 views

Build a vbo once every second

I have a VBO storing some data in my game. The thing is, the data can change at a rate of about a second. The data is not fixed size, meaning that some objects will sometimes be visible, sometimes ...
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0answers
222 views

Drawing multiple polygons with vertex buffer object

I tried to create program in which I would draw multiplepoygons here is fragment of what I have done: GLuint VertexArrayID; exampleof drawing triangle(I have ...
4
votes
1answer
550 views

Efficient vertex buffer memory management?

I am building a voxel engine with a similar mechanism to minecraft(yes, I know...). It works by loading and unloading individual chunks of 16*64*16 cubes each in a square grid around the player. This ...
6
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0answers
269 views

How to draw Shadow Volumes in one draw call?

I've got a simple app that draws 3D cubes using instance rendering and I'm implementing Shadow Volume. Each cube's vertex, uv, normal and index data are statically stored in 4 vertex array buffers. On ...
1
vote
2answers
289 views

Reading mesh data back from OpenGL vs storing two copies

I'm wondering if whether it's a good idea or not to keep a copy of vertex data in the main memory or just read it back via glGetBufferSubData (or ...
1
vote
1answer
162 views

ID3D11Buffer and std::array : buffer looks empty

I am having trouble at rendering vertices stored in a std::vector. ...
1
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0answers
65 views

Is it possible to have a SoA Vertex Buffer in DirectX 11?

Hi! I'm wondering if it is possible to structure a Vertex Buffer in a SoA approach like this { x1, x2, x3 . . . xn, y1, y2, y3 . . . yn, z1, z2, z3 . . . zn } instead of the traditional AoS ...
0
votes
2answers
295 views

How to handle mesh update in its vertex buffer

suppose i have a mesh, it can undergo any kind of changes - bend, stretch, even been torn. How should i update vertex buffer in DirectX for this mesh. For now i recreate it every time, and i don't see ...
1
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0answers
90 views

XNA maximum VertexBuffer size exception

I am trying to build content(a text file contains list of triangles vertices) for an XNA application through a custom pipeline importer. It works ok. But when number of triangles gets near 1m(in this ...
1
vote
1answer
401 views

How to retrieve vertex information from ID3DXMesh

I need to know the position of each vertex (and triangles) from a mesh (a pointer to ID3DXMesh, created by calling functions like ...
2
votes
1answer
2k views

MonoGame: Draw thousands of quads without hardware instancing

In my game, every bit of geometry is a textured quad billboard in 3D. I have many thousands of these things on screen at once, sometimes with overdraw. As I understand it, there are a few ways I can ...
0
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1answer
346 views

Making multiple VertexPositionColor variables in the same class? - XNA

I have studying XNA on my spare time for about a year now and I could use some professional help on this issue. Any time given to my problem is appreciated. I have two VertexPositionColor variables ...
0
votes
1answer
317 views

Insufficient memory on creating vertex buffers

I'm building a voxel world generator with XNA where the voxels are rendered as polygonal cubes. The world is divided into 1024 chunks of 32x32x256 cubes each (as 32 chunks by 32 chunks), and each ...
1
vote
1answer
178 views

How to fix model matrices colliding in vertex shader?

I am new to OpenGL programming and I'm writing some basic code to display a few objects onto a screen. I have a pyramid shape that I'm displaying, as well as a box shape that I am displaying. The ...
0
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3answers
135 views

Arbitrary number of VBO to Vertex Shader

I am currently using standard modern OpenGL way to render a mesh via VBO and attributes ...
0
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3answers
1k views

Can I mix the use of VAO and direct usage of glVertexAttribPointer?

Let's say I am not using VAOs. I have an array of vertex positions in memory that I want to send to the shader. I do the following (assume I have enabled the corresponding vertex attrib arrays): <...
2
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1answer
89 views

Vertex definitions and shaders [closed]

I noticed that from looking at other examples like say .. riemers tutorials he takes a buffer with a bunch of vector3's in it and ties it to a shader which expects a float4 ... why does this work in ...
0
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1answer
98 views

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 ...
8
votes
1answer
1k views

How do commercial games engines organise the index/vertex buffers?

Preface: This question is going to be coming from a Direct3D point-of-view, because that's what I'm familiar with. Obviously we incur a slight overhead every time we change the vertex or index ...
0
votes
1answer
74 views

Geometry design and buffers

I'm making some tests with rendering stuff and I'm wondering how to design my Geometry class. For the moment, here is how I do: Init: Stock array with positions, array with colors, array with normals,...
1
vote
1answer
902 views

Techniques for managing vertex buffer memory

I'm learning OpenGL and I haven't seen any advice on managing vertex buffers in all of the tutorials I've read. The basic problem is that I have some memory allocated as a buffer B in which I'm going ...
4
votes
3answers
738 views

Using same buffer for vertex and index data?

Is it possible to use the same buffer for both GL_ARRAY_BUFFER and GL_ELEMENT_ARRAY_BUFFER? I load both vertex data and index ...
2
votes
1answer
1k views

Draw call optimization for multiple meshes in DirectX11

I have a large scene in a B3D model, which includes about 120 meshes as in the following pictures: large B3D scene http://s22.postimg.org/d1h75hr0v/Untitled.png Each mesh contain a vertex buffer ...
1
vote
1answer
3k views

gl_VertexID values when calling glDrawElements

I am struggling a bit to understand the values that gl_VertexID primitive contains when the vertex shader is executed. I have the standard modern rendering ...
0
votes
1answer
740 views

Providing texture coordinates and using indexed drawing at the same time

Please consider the following vertex structure struct vertex { vec3 posL, normalL; }; Using this vertex layout, we can provide the vertex data in an ...
0
votes
1answer
367 views

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 ...
1
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1answer
798 views

How to use LWJGL Vertex Buffer Objects?

I have been learning how to make a game with LWJGL for a while now by following YouTube tutorials online but I've recently been having a problem understanding Vertex Buffer Objects. I've looked at ...
0
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2answers
459 views

How to draw non-triangulated mesh?

I am working with DirectX (C#/C++). I am wondering is it possible to do not triangulate meshes and what the difference between cases (in loading and rendering code)? If so, how to do this? I know <...