Draw obj file opengl

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am having an issue with displaying all of my objects with openGL.

I have 5 different obj files:cube, teapot, lamp, a man, and a car. The cube, lamp and man draw just fine however the teapot and car do not render correctly.

draw obj file opengl

I have a method that reads in the obj file, and i have made printouts to double check if the output matches the obj file and they are all correct. I am not sure what I am doing wrong or if I am doing anything wrong with the code I presented.

Here is my Teapot Here is the teapot its suppose to look like. Also, glNormal only latches some state. Only the most recent glNormal call will have any effect because it will overwrite any other glNormal since the last glVertex.

Learn more. Asked 6 years, 4 months ago. Active 6 years, 4 months ago. Viewed 5k times. DWolf DWolf 6 6 silver badges 19 19 bronze badges. Is there anything else that's different about the cube, lamp and man vs. Are all the objects loaded from. Active Oldest Votes. You provide normals via glNormalnot glVertex. So you need to interleave your glNormal calls: glNormal3f vn[ f[i].

This solves the car and makes the other images look better! Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Game Development Stack Exchange is a question and answer site for professional and independent game developers. It only takes a minute to sign up. How are they drawn? I don't know how to read these file types. Thanks in advanced! There is a good documentation on Wikipedia.

18.7: Loading OBJ Model - WebGL and officeconnecttuneboss.online Tutorial

The format is made by Wavefront, you'll find lot more information online with this name. This is the Wikipedia article. Basically, v means vertex position, vt means texture coordinate and vn means vertex normal.

In OpenGL instead, an index is expected to point at at a single position in all those attributes at once. You may consider to use that library from the beginning. The problem with the obj format is that it isn't standardised. So you'll see some that use clockwise winding not good for a naive implementation in OpenGL some that use counter-clockwise winding not good for a naive implementation in DirectX plus all other kinds of quirks that are vendor-dependent eg.

draw obj file opengl

The last type is vn which contains the normal vector for every vertex useful for Gouraud or Phong shading. The last important part starts with f, meaning face. Usually these are triangles but you may encounter quads. That means you have three vertices: 1st vertex uses the position on the first line that starts with Vthe texture coordinates on the 1st line that starts with vt and so on for vn.

The third index uses the information referenced in the fifth line that uses vn, while the other two paramters are from their respective third lines. Knowing this, it is very easy to make an OBJ parser that reads such files, as long as you keep it simple and don't try to cover all cases clock-wise counterCWquds vs triangles and so on.

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Need help drawing obj file! Asked 6 years, 11 months ago. Active 6 years, 11 months ago. Viewed 2k times. PS: I can't find anything helpful online, that's why I'm asking this here.You seem to have CSS turned off. Please don't fill out this field. Please provide the ad click URL, if possible:. Help Create Join Login. Operations Management. IT Management. Project Management. Services Business VoIP. Resources Blog Articles Deals. Menu Help Create Join Login. Add a Review. Get Updates. Get project updates, sponsored content from our select partners, and more.

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am finding difficulty in converting. I have found my model and here i have attach the main.

I am unsure of how to run the files. Which file should I run when I called all these files in openGL. But it shows many errors. The error says that cant find PDB file. What is that? I'm just throwing in my answer to clear up the misconception leading to a question like that one:. It there for a program to make calls to draw points, lines and triangles. OpenGL is not a file format. OBJ is actually not very well defined name for a file format there are literally hundreds of file formats that end.

Anyway, files contain data. And while a program is data as well, a Wavefront OBJ file is not a program and can not be executed. What you need to do is writing a program, that reads the data from the Wavefront OBJ file, and uses that data to make the right calls to OpenGL.

The other answers you already got link to such tutorials. You will need to parse the. But I think the real answer here lies in more study and not jumping in the deep water when you can hardly doggy paddle.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Game Development Stack Exchange is a question and answer site for professional and independent game developers.

Tutorial 7 : Model loading

It only takes a minute to sign up. The OBJ file obviously shares same vertices for adjacent faces even if the faces get different materials. When drawing such a cube with OpenGL however, I would need to duplicate the vertices of the adjacent faces with different materials, since every vertex specifies the color it has - and I have two different colors for the same vertices here, depending on the face and the different material it has.

If I wouldn't do that, the adjacent faces would smooth over to the different materials. Second: If not, is there an easier way to keep track of the faces materials and duplicating the adjacent vertices if they get different materials?

What would be the easiest way to implement different materials on one object? You need two vertexes in such this case. There is no way around it. If the faces have a different texture then you will need a different vertexes to define them.

To simplify it you could try to save the mesh in such way - check whatever modelling program you use. Sometime it may be as simple as telling it not to weld vertexes together. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.

Asked 5 years, 2 months ago. Active 5 years, 1 month ago. Viewed 1k times. Consider the following example: It's a cube with 5 sides Gray and 1 side Green. Ray Ray 1 1 gold badge 4 4 silver badges 13 13 bronze badges. Active Oldest Votes.

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draw obj file opengl

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Samples showing how to use this library are available in the ObjSamples project. This is a simple loader and writer for Wavefront. OBJ files. The elements that are currently supported are.

The Obj interface is basically an in-memory representation of an OBJ file. The ObjReader class may either create a new Obj object directly from an input stream, or pass the elements that are read from the input stream to a WritableObj.

The ObjWriter class offers a method to write a ReadableObj object to an output stream. The ObjData class offers various methods to obtain the data that is stored in a ReadableObj as plain arrays or direct buffers.

These methods may The latter operations are also summarized in one dedicated method, namely the ObjUtils. An OBJ may contain multiple material definitions. When such an OBJ should be rendered with OpenGL, this usually means that there will be one shader for each material - or at least, different textures may have to be used for different parts of the objects.

This library offers methods to extract the parts of the OBJ that have the same material. In the OBJ format, these groups consist of the triangles that follow one usemtl directive.

When such an OBJ file is read, the resulting material groups may be obtained from the ReadableObj object, and each of them can be converted into a new Obj object using the ObjUtils groupToObj method. In certain environments, the number of vertices that may be involved in one rendering call is limited.

In these cases, larger OBJ files have to be split into multiple parts. Additionally, the index buffers that are passed to the rendering API may not contain 4-byte int elements, but only 2-byte short elements.

The ObjSplitting class contains a method that allows splitting an OBJ into multiple parts, each having only a maximum number of vertices. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. A simple Wavefront OBJ file loader. Java Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit Feb 12, Overview This is a simple loader and writer for Wavefront.You seem to have CSS turned off.

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