vbo

问题 I'm generating my VBO with this code int SCREEN_WIDTH = 800; int SCREEN_HEIGHT = 480; int PIXEL_PER_VERTEX = 4; int CAVERN_TEXTURE_WIDTH = 1024; int CAVERN_TEXTURE_HEIGHT = 512; final int vertexCount = ((SCREEN_WIDTH / PIXEL_PER_VERTEX) +1 ) * 2; final float[] bufferDataLowerCave = new float[vertexCount * CavernBoundMesh.VERTEX_SIZE]; for(int i=0; i < vertexCount; i += 2) { bufferDataLowerCave[i * CavernBoundMesh.VERTEX_SIZE + CavernBoundMesh.VERTEX_INDEX_X] = PIXEL_PER_VERTEX * i / 2.f;

问题 I'm generating my VBO with this code int SCREEN_WIDTH = 800; int SCREEN_HEIGHT = 480; int PIXEL_PER_VERTEX = 4; int CAVERN_TEXTURE_WIDTH = 1024; int CAVERN_TEXTURE_HEIGHT = 512; final int vertexCount = ((SCREEN_WIDTH / PIXEL_PER_VERTEX) +1 ) * 2; final float[] bufferDataLowerCave = new float[vertexCount * CavernBoundMesh.VERTEX_SIZE]; for(int i=0; i < vertexCount; i += 2) { bufferDataLowerCave[i * CavernBoundMesh.VERTEX_SIZE + CavernBoundMesh.VERTEX_INDEX_X] = PIXEL_PER_VERTEX * i / 2.f;

问题 this question is similar to something I asked here Android OpenGL ES 2: Introduction to VBOs however I tried multiple aproaches since then and I still haven't succeeded, so I think posting another question where I offer aditional details would be a better aproach. I am new to OpenGL ES 2 on Android (I have never worked with another OpenGL, I just need to draw something for an app I am developing for Android) and I would very much like to understand how to use VBOs. I tried to modify this

问题 I want to send a buffer list (to the GPU/vertex shader) which contains information about vertex position, world position, color, scale, and rotation. If each of my 3D objects have transformation related information in a matrix, how can i pass this array of matrices (in addition to the other vertex data) to the GPU via the VBO(s) ? Updated Please excuse any typos: // bind & set vertices. gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer); gl.vertexAtribPointer(a_Position, 3, gl.FLOAT, false, stride,

问题 I am using OpenGL3.2 Core Profile on OSX. And I want to do instanced drawing (glDrawArraysInstanced), where I pass a matrix for each instance. My vertex shader builds just fine: #version 150 in mediump vec4 position; in mediump mat4 trf; in lowp vec4 rgb; out lowp vec4 colour; uniform highp mat4 modelcamviewprojmat; void main() { mediump vec4 tpos = trf * position; gl_Position = modelcamviewprojmat * tpos; colour = rgb; } The binding of 'trf' went fine: glBindAttribLocation(program, ATTRIB

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I have a sample code which initialize a VBO with a triangle and then renders it. My main rendering loop is: // Clear Color and Depth Buffers glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Reset transformations glLoadIdentity(); // Set the camera gluLookAt( x, 1.0f, z, x+lx, 1.0f, z+lz, 0.0f, 1.0f, 0.0f);

问题 How do I attach a texture to a VBO? I had it working with a colorBuffer and now i want to implement a texture. This is my draw method: Color.white.bind(); glBindTexture(GL_TEXTURE_2D, texture.getTextureID()); glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle); glBufferData(GL_ARRAY_BUFFER, vertexData, GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle); glBufferData(GL_ARRAY_BUFFER, textureData, GL_STATIC_DRAW); glVertexPointer(vertexSize, GL_FLOAT, 0

问题 Is there a way to alter vertex attributes in a vertexshader/vertexprogram and save the changes back into the VBO? 回答1: Yes, that is called Transform Feedback in OpenGL (or Stream-Out in DirectX): http://www.opengl.org/registry/specs/EXT/transform_feedback.txt http://www.opengl.org/registry/doc/glspec42.core.20120119.pdf (page 158) http://msdn.microsoft.com/en-us/library/windows/desktop/bb205121.aspx 来源： https://stackoverflow.com/questions/9530387/vertexshader-vertexprogram-write-vertex

问题 So I've written a program that renders a mesh using a Vertex Buffer Object, and lets me move the camera around. I now want to make the object move independently of the camera/view. However, I'm not sure how to go about moving my meshes through space. Googling tends to find sources either telling me to rotate the objects with glRotatef(), etc., or that using glRotatef() and its siblings is a bad idea because they are deprecated. Perhaps I'm not using the right search terms, but I'm not finding

问题 Currently, I'm attempting to create a Camera class in LWJGL, but I've been running into a problem with the projection matrix. For some reason, when I try to multiply the vertices by the projection matrix, nothing at all appears on screen. Camera class public class Camera { private Vector3f position, rotation; private Matrix4f view; private final Vector3f xAxis, yAxis, zAxis; private float fov, aspect, zNear, zFar; private Matrix4f projection; public Camera(float fov, float aspect, float zNear