textures

When I pass non max values into texture buffer, while rendering it draws geometry with colors at max values. I found this issue while using glTexBuffer() API. E.g. Let’s assume my texture data is GLubyte, when I pass any value less than 255, then the color is same as that of drawn with 255, instead of mixture of black and that color. I tried on AMD and nvidia card, but the results are same. Can you tell me where could be going wrong? I am copying my code here: Vert shader: in vec2 a_position; uniform float offset_x; void main() { gl_Position = vec4(a_position.x + offset_x, a_position.y, 1.0, 1

I’m converting a game from XNA to iOS with Monogame. In the code snippet below, smallDeform is a Texture2D on which I call the GetData method. smallDeform = Game.Content.Load<Texture2D>("Terrain/..."); smallDeform.GetData(smallDeformData, 0, smallDeform.Width * smallDeform.Height); I’m having some problem with Monogame because the feature in iOS has not been implemented yet because it returns this exception. #if IOS throw new NotImplementedException(); #elif ANDROID I tried to serialize the data in a XML file from Windows to load the whole file from iOS. The serialized files weight more than

I have an extremely simple PNG texture: a grey circle with a transparent background. I use it as a uniform map for a THREE.ShaderMaterial : var uniforms = THREE.UniformsUtils.merge( [basicShader.uniforms] ); uniforms['map'].value = THREE.ImageUtils.loadTexture( "img/particle.png" ); uniforms['size'].value = 100; uniforms['opacity'].value = 0.5; uniforms['psColor'].value = new THREE.Color( 0xffffff ); Here is my fragment shader (just part of it): gl_FragColor = vec4( psColor, vOpacity ); gl_FragColor = gl_FragColor * texture2D( map,vec2( gl_PointCoord.x, 1.0 - gl_PointCoord.y ) ); gl_FragColor

When I load textures from images normally, they are upside down because of OpenGL's coordinate system. What would be the best way to flip them? glScalef(1.0f, -1.0f, 1.0f); mapping the y coordinates of the textures in reverse vertically flipping the image files manually (in Photoshop) flipping them programatically after loading them (I don't know how) This is the method I'm using to load png textures, in my Utilities.m file (Objective-C): + (TextureImageRef)loadPngTexture:(NSString *)name { CFURLRef textureURL = CFBundleCopyResourceURL( CFBundleGetMainBundle(), (CFStringRef)name, CFSTR("png"),

I feel like I'm missing something simple here. I used JSFiddle by @WestLangley , which demonstrates how to cast a shadow from an object onto a plane. Everything works as expected when the plane is filled with just color: var groundMaterial = new THREE.MeshLambertMaterial({ color: 0xFF0000 }); Then I change it to use texture instead: var groundMaterial = new THREE.MeshLambertMaterial({ // color: 0xFF0000, map: texture }); ..all of a sudden, shadow is gone: This happens with both MeshPhongMaterial and MeshLambertMaterial . Note that neither camera position nor shadow configuration is changed.