All you have done is effectively implement Euler angles with quaternions. That’s not helping. The problem with Euler angles is that, when you compute the matrices, each angle is relative to the rotation of the matrix that came before it. What you want is to take an object’s current orientation, and apply a rotation along … Read more
The relevant input data to your problem are the texture coordinates. Tangent and Binormal are vectors locally parallel to the object’s surface. And in the case of normal mapping they’re describing the local orientation of the normal texture. So you have to calculate the direction (in the model’s space) in which the texturing vectors point. … Read more
Windows On Windows you need to include the gl.h header for OpenGL 1.1 support and link against OpenGL32.lib. Both are a part of the Windows SDK. In addition, you might want the following headers which you can get from http://www.opengl.org/registry . <GL/glext.h> – OpenGL 1.2 and above compatibility profile and extension interfaces.. <GL/glcorearb.h> – OpenGL … Read more
Theory Why it is hard Popular font formats like TrueType and OpenType are vector outline formats: they use Bezier curves to define the boundary of the letter. Image source. Transforming those formats into arrays of pixels (rasterization) is too specific and out of OpenGL’s scope, specially because OpenGl does not have non-straight primitives (e.g. see … Read more
OpenTK is an improvement over the Tao API, as it uses idiomatic C# style with overloading, strongly-typed enums, exceptions, and standard .NET types: GL.Begin(BeginMode.Points); GL.Color3(Color.Yellow); GL.Vertex3(Vector3.Up); as opposed to Tao which merely mirrors the C API: Gl.glBegin(Gl.GL_POINTS); // double “gl” prefix Gl.glColor3ub(255, 255, 0); // have to pass RGB values as separate args Gl.glVertex3f(0, 1, … Read more
When I compared your code with mine working engine I see these differences so try them one by one: texture format you are using: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, screen_width, screen_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); so merging all your to: GL_COLOR_ATTACHMENT0: GL_RGBA,GL_RGBA,GL_UNSIGNED_BYTE GL_COLOR_ATTACHMENT1: GL_RGBA,GL_RGBA,GL_UNSIGNED_BYTE I am using: GL_COLOR_ATTACHMENT0 : GL_RGBA , GL_RGBA8 , GL_UNSIGNED_BYTE GL_DEPTH_ATTACHMENT : GL_DEPTH_COMPONENT, … Read more
All OpenGL functions, with the exception noted below, will be finished with any pointer you give it upon that function’s return. So glReadPixels will have finished all pixel reading and format conversion upon its return. This is why asynchronous pixel transfer is so important for reading operations. It allows OpenGL to not do that, to … Read more
Looks like OpenGL is trying to report some error on Win2003, however you’ve not configured your system where to output logging info. You can add the following to the beginning of your program and you’ll see details of the error in stderr. import logging logging.basicConfig() Checkout documentation on logging module to get more config info, … Read more
Why does java app crash in gdb but runs normally in real life? Because it doesn’t actually crash. Java uses speculative loads. If a pointer points to addressable memory, the load succeeds. Rarely the pointer does not point to addressable memory, and the attempted load generates SIGSEGV … which java runtime intercepts, makes the memory … Read more
If with “world coordinates” you mean “object coordinates”, you have to get the inverse transformation of the result given by the pnp algorithm. There is a trick to invert transformation matrices that allows you to save the inversion operation, which is usually expensive, and that explains the code in Python. Given a transformation [R|t], we … Read more