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Asked: 2026-05-27T00:25:54+00:00

I d like to parse an .obj file. My parser is working good, but

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I d like to parse an .obj file. My parser is working good, but my displaying is not good.
Obj file is here

my code is:

    public ObjModelParser parse() {
        long startTime = System.currentTimeMillis();

        InputStream fileIn    = resources.openRawResource(resourceID);
        BufferedReader buffer = new BufferedReader(new InputStreamReader(fileIn));
        String line="";

        Log.e("model loader", "Start parsing object " + resourceID);

        try {
            while ((line = buffer.readLine()) != null) {
                StringTokenizer parts = new StringTokenizer(line, " ");
                int numTokens = parts.countTokens();
                if (numTokens == 0) continue;

                String part = parts.nextToken();

                if (part.equals(VERTEX)) {
                    Log.e("v ", line);

                    vertices.add(Float.parseFloat(parts.nextToken()));
                    vertices.add(Float.parseFloat(parts.nextToken()));
                    vertices.add(Float.parseFloat(parts.nextToken()));
....

and my displaying code is:

draw that model with TRIANGLE_STRIP and gl.glDrawArrays(rendermode, 0, coords.length/dimension);

enter image description here

What is the mistake here?

edited: file here to show what is my good coords from my program for a cube, and what is from .obj file, that never show

Thanks, Leslie

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1 Answer

  1. Editorial Team

    You are trying to draw using TRIANGLE_STRIP instead of TRIANGLES, did you do the work and put the necessary degenerate triangles for STRIP to work ?

    If you did put in those degenerate triangles I would bet a problem there, could we look at the data output from your parser ? say just the first 10 triangles…

    If you didn’t create the degenerate triangles or don’t know what that is just change the draw from TRIANGLE_STRIP to TRIANGLES, also using a triangle strip with a model like this limits some trick you can make with the normals, to produce better looking graphics. (if your going with simple or cartoony look ignore this part).

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