Contribute to thiagopsilva/Apostila-android development by creating an account on GitHub. Veja grátis o arquivo Apostila PyOpenGL enviado para a disciplina de Sistemas In this new from import * format, we can use OpenGL module commands. in due course. 2. Introduction OpenGL (Open Graphics Library) is a cross- platform, hardware-accelerated, apostila CPA 10 Uploaded by Marcella Costa.

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You will know when you are using commands from each specific OpenGL module by looking at the first few letters of the OpenGL command.

Ditto for if statements and for loops. You’ll note also that this is the only code in MilkshapeModel because it is the only code specific to Apostilla. We can easily fix this by adding one line of code.

Jeff Molofee’s OpenGL Windows Tutorial #32

This takes the place of calling LoadGLTextures as we used to. It is difficult to understand what is wrong when working on the stencil buffer, because we have no direct way to see it. And if I get around to it, I will write more loader classes to make the program more versatile. Now it’s time to introduce the stencil buffer. Another method is to fill the screen using two triangles, and with a stencil test for instance, to match only non-0 stencil pixels.

Finally, we are going to add two more lines to our first program. GLGLU commands. The portions of PortaLib3D included here retain my copyright notices. It is drawn centered at the origin assuming it was modelled around the origin in Milkshape 3D!

OpenGL Programming/Stencil buffer – Wikibooks, open books for an open world

You’ll see that the background moves with the window! Finally add these lines, making certain to line apostkla up even with the left-hand margin.


The import statements add extra functions to this basic set of commands. For more information visit his Homepage. Note that the texture is only bound and enabled if it is greater than 0.

To summarize, each of the from OpenGL statements adds new commands to Python. The memory for the triangle indices is dynamically allocated within the mesh and read one at a time. As for the vertices, this part of the function stores all of the triangles in the model. But the model doesn’t need to be reloaded, as its data remains intact. Much simpler, don’t you think? Texturing is also disabled if there was no material at all for the mesh.

First memory is allocated in the model for the vertices, and then each is parsed from the file as the pointer is advanced. You should see something that looks similar to Figure 4.

You can use that. Finally, the model is drawn with its draw member function. The reason I use this is because it is a damn fine modelling package, and it includes its file-format so it is easy to parse and understand.

First, and most important, we need vertices: The stencil buffer can be manipulated using glStencilFunc and glStencilOp: This final fragment of code sets the texture mapping state back to its original value. It loops through each of the triangles for the mesh, and then draws each of its three vertices, including the normal and texture coordinates.

OpenGL Programming/Stencil buffer

The above code reads each of the vertex structures in the file. The indents mark these lines as belonging to this particular function. If it is set to 0, you’ll recall, there was no texture, so texturing is disabled. The fields of the header are checked to make sure that this is a valid file we are reading. Views Read Edit View history. Click on the line that contains the glutInitDisplayMode command.


My next plan is to implement an Anim8or file apositla because it is free and of course a 3DS reader. A mesh apstila a group of triangles that all have the same material applied to them.

Policies and guidelines Contact us. Later we apoatila learn how to avoid glFlush by using something called buffering. This is done in the same way as those above, copying each of the lighting coefficients into the new structure.

Next we need to group these vertices into triangles: It is a binary file, hence the ios:: Lets look at that function now: Press “Enter” twice to make room for the following two lines of code. It is created in WinMain: Opebgl that there’s no need to use a separate program to draw in the stencil buffer.

This doesn’t mean they can’t be used by you – it means that if you cut-and-paste the code into your project, you have to give me proper credit. By using this site, you agree to the Terms of Use and Privacy Policy. We won’t discuss these functions because they are not related to the stencil feature, but you’re invited to look at the source code see at the link at the bottom of this page.

If it is not found, the function returns false to indicate an error. Click the link above! Mostly it came from Lesson 6, with a small modification to the loading of textures and the drawing routine. So at this point, the protected member variables of the Model class are filled with the model opemgl.