Before I come to your question, let me explain some core concepts of matrices. Assume that we have the following matrix: wher T is a translation and R is a rotation matrix. When we use this matrix to transform a vertex (or even mesh), there is one unique result. However, we can get to this … Read more
glewExperimental = GL_TRUE; glewInit(); Should do the magic Experimental Drivers GLEW obtains information on the supported extensions from the graphics driver. Experimental or pre-release drivers, however, might not report every available extension through the standard mechanism, in which case GLEW will report it unsupported. To circumvent this situation, the glewExperimental global switch can be turned … Read more
First we create an empty (or unititialized) cv::Mat for our data to be read into directly. This can be done once at startup, but on the other hand cv::Mat::create doesn’t really cost much when the image already has matching size and type. The type depends on your needs, usually it’s something like CV_8UC3 for a … Read more
If you have a std::vector<T> v, you may obtain a T* pointing to the start of the contiguous data (which is what OpenGL is after) with the expression &v[0]. In your case, this means passing a Vertex* to glBufferData: glBufferData( GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW ); Or like this, which is the same: glBufferData( … Read more
You can’t easily communicate back to the CPU from within GLSL. Using glslDevil or other tools is your best bet. A printf would require trying to get back to the CPU from the GPU running the GLSL code. Instead, you can try pushing ahead to the display. Instead of trying to output text, output something … Read more
Rendering outlines, unless you render only a dozen characters total, remains a “no go” due to the number of vertices needed per character to approximate curvature. Though there have been approaches to evaluate bezier curves in the pixel shader instead, these suffer from not being easily antialiased, which is trivial using a distance-map-textured quad, and … Read more
OpenGL (and D3D. And Metal. And Mantle. And Vulkan) doesn’t support this because hardware doesn’t support this. Hardware doesn’t support this because, for the vast majority of mesh data, this would not help. This is primarily useful for meshes that are predominantly not smooth (vertices sharing positions but not normals and so forth). And most … Read more
Set the keyword argument collect_faces = True, when you read the Wavefront .obj file. That causes that triangle face data are collected for every mesh.: (See PyWavefront) scene = pywavefront.Wavefront(‘Handgun_obj.obj’, collect_faces=True) Compute the scene box. The vertices are contained in scene.vertices. Each vertex is tuple with 3 components (x, y, z coordinate): scene_box = (scene.vertices[0], … Read more
you have to point the jvm to where the native files are located using a command line parameter -Djava.library.path=”path/to/natives”. You could use a batch (.bat) file to specify this and start your application for you. Alternatively you can use a tool like JarSplice to create a single executable jar file from all your jars and … Read more
While you believe that the problem has nothing to do with storing the objects in a vector, I have a strong feeling that it probably does. The way you are encapsulating OpenGL objects in C++ wrappers is a recipe for pain, and you’re probably finding out like many did before you. The typical problems are … Read more