opengl-es-2.0

问题 I want to build a opengl es 2.0 view extend from UIview. And flow this article:http://www.raywenderlich.com/3664/opengl-es-2-0-for-iphone-tutorial when I finished first step. everything runs wrong. It did not run as I throught. Here is my code: #import <UIKit/UIKit.h> #import <QuartzCore/QuartzCore.h> #import <OpenGLES/ES2/gl.h> #import <OpenGLES/ES2/glext.h> @interface NXGLES2View : UIView - (void) render; @end #import "NXGLES2View.h" @interface NXGLES2View () { CAEAGLLayer *eaglLayer_;

问题 I am quite new to using OpenGL ES 2.0. Also im using an iPhone and the GLM maths library. As I reference I have been using this tutorial a lot: http://tomdalling.com/blog/modern-opengl/03-matrices-depth-buffering-animation/ But I have found it difficult to find a 2D OpenGL tutorial. I am trying to rotate a 2D sprite but the image is being distorted. For example at a rotation angle of 0 degrees: http://i.imgur.com/yBTN2ST.png and at a rotation angle of 45 degrees: http://i.imgur.com/cY5IJcg

问题 I am trying to render 2D (flat) sprites in a 3D environment using OpenGL ES 2. The way I create each sprite is pretty standard: I create a quad consisting of two triangles, and I map the texture onto that. Everything works fine, except I noticed something strange: when depth testing is turned on (which it should be in 3D mode), the corners of my sprites are painted using the background color. The easiest way to show this is by illustration: When I turn off depth testing (on the left) it looks

问题 I found a 3D graphics framework for Android called Rajawali and I am learning how to use it. I followed the most basic tutorial which is rendering a shpere object with a 1024x512 size jpg image for the texture. It worked fine on Galaxy Nexus, but it didn't work on the Galaxy Player GB70. When I say it didn't work, I mean that the object appears but the texture is not rendered. Eventually, I changed some parameters that I use for the Rajawali framework when creating textures and got it to work

问题 Just curious; How do I place my webgl shaders, in an external file? Currently I'm having; <script id="shader-fs" type="x-shader/x-fragment"> #ifdef GL_ES precision highp float; #endif void main(void) { gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0); } </script> <script id="shader-vs" type="x-shader/x-vertex"> attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; uniform mat4 uPMatrix; void main(void) { gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0); } </script> In my html header,

问题 I am given two GLKVector3 's representing the start and end points of the cylinder. Using these points and the radius, I need to build and render a cylinder. I can build a cylinder with the correct distance between the points but in a fixed direction (currently always in the y (0, 1, 0) up direction). I am not sure what kind of calculations I need to make to get the cylinder on the correct plane between the two points so that a line would run through the two end points. I am thinking there is

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 I am developing a game for Android using OpenGL ES 2.0 and have a problem with a fragment shader for drawing stars in the background. I've got the following code: precision mediump float; varying vec2 transformed_position; float rand(vec2 co) { return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453); } void main(void) { float distance = 10.0; float quantization_strength = 4.0; vec3 background_color = vec3(0.09, 0.0, 0.288); vec2 zero = vec2(0.0, 0.0); vec2 distance_vec = vec2

问题 I am developing a game for Android using OpenGL ES 2.0 and have a problem with a fragment shader for drawing stars in the background. I've got the following code: precision mediump float; varying vec2 transformed_position; float rand(vec2 co) { return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453); } void main(void) { float distance = 10.0; float quantization_strength = 4.0; vec3 background_color = vec3(0.09, 0.0, 0.288); vec2 zero = vec2(0.0, 0.0); vec2 distance_vec = vec2