Import OBJ Model - Support Negative Indexes

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  • Proposals: 3
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  • #1993983
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Niraj K.Ronak P.Mario V. have already sent a proposal.
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Experience Level: Entry

I'm looking for C++ programmers to help me develop CrackArt, an open source 3D painting and compositing application. I am in the process of updating CrackArt to a new user interface library (Qt) and display system (Vulkan), and I need a programmer to help me on a long time project, but managed by short and well-defined deliverables.

I'm a software engineer and each deliverable will be concrete, well defined and with clear completion criteria.

Current Milestone

- Finish OBJ import module.

Future Milestones

- Implement FBX import module.
- Implement glTF import module.

Current Deliverable Description (THIS PROJECT)

CrackArt imports 3D files in OBJ format. The current implementation is missing some OBJ features.

For this deliverable, I need the OBJ implementation to support negative index numbers.

It is also possible to reference points using negative indices, where the indices are specified relative to the current maximum vertex position (-1 references the last vertex defined). This makes it easy to describe the points in a face, then the face, without the need to store a large list of points and their indexes. In this way, "v" commands and "f" commands can be interspersed.

v -0.500000 0.000000 0.400000
v -0.500000 0.000000 -0.800000
v -0.500000 1.000000 -0.800000
v -0.500000 1.000000 0.400000
f -4 -3 -2 -1

I am attaching to this project a zip file that contains:

How To Build CrackArt
An HTML document that describes how to build CrackArt.

OBJ Files - Working
A set of OBJ files that CrackArt can import and display correctly.

OBJ Files Negative Indexes
8 simple OBJ files with negative indexes that CrackArt fails to import.


Update the Obj Importer Exporter code to support OBJ negative indexes. The files that need to be modified are:

Most probably the method:

Status WavefrontObjImporter::LoadObjFile(std::string filename)

Completion Criteria

After this deliverable CrackArt must be able to import and display the models in the OBJ_Files/Negative_Indexes directory of the zip file. CrackArt should also be able to import and display the files in the OBJ_Files/Working directory, which are working with the current code.

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