5/6/2021 0 Comments Opengl 3D Example
The third line makes the program render triangles regardless of which direction their normals point to.However, like many technologies, there are sometimes obstacles making it difficult for developers trying to enter into this niche.Over time, the race between DirectX and OpenGL has caused these technologies to become more accessible to developers, along with better documentation and an easier process of becoming a skilled DirectX or OpenGL developer.On the other hand, OpenGL is a cross-platform API for the 3D graphics arena whose specification is maintained by the Khronos Group.
![]() Opengl 3D Example Code Of TheThe source code of the prototype built for this article is available on GitHub. The 3D model in the rendered scene will be rotatable and zoomable, to give a better sense of depth and dimension. This article requires some familiarity with the Qt framework. However, if you are not familiar with the framework, please do not feel discouraged to follow along, as the prototype relies on some fairly trivial features of the framework. In that case, please make sure you are using the appropriate Qt Addin for Visual Studio. Since it is a bare-bones widget, compiling and running it will not produce anything useful. With Qt designer, we will add a File menu with four items: New, Open, Close, and Exit. You can find the code that binds these menu items to their corresponding actions in the repository. Clicking on Create should save the model, and should also open it if the user chooses the appropriate option from the lower-left corner. As you can tell, the goal here is to convert some user inputted text into a 3D model and render it on the display. This implements the dialog widget which allows the user to type text, select font, and choose whether to save the result into a file andor display it in 3D. These files were left unchanged since they were created by Qt Creator wizard. There are certainly some more interesting aspects of this prototype application, ones that are not only important but also relevant to 3D model encoding and rendering that we want to cover. For example, the first step of converting text to a 3D model in this prototype involves converting the text to a 2D monochrome image. ![]() There are some simpler ways of rendering basic text using OpenGL, but we are taking this approach in order to cover some nitty-gritty details of 3D rendering with OpenGL. ![]() Opengl 3D Example Update This QImageWhen the user enters some text, we synchronously update this QImage object. Based on the font size and image width, we try our best to fit the text within the user defined height. Based on this, we can generate a list of triangles, computing the coordinates of their vertices, and store them in our 3D model file. For OpenGL based 3D rendering, Qt provides a widget called QOpenGLWidget.
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