Import OBJ Model - Support Negative Indexes
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Description
Experience Level: Entry
=========================================================
PROJECT
=========================================================
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.
https://people.cs.clemson.edu/~dhouse/courses/405/docs/brief-obj-file-format.html
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.
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Deliverables
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Update the Obj Importer Exporter code to support OBJ negative indexes. The files that need to be modified are:
https://sourceforge.net/p/sceneengine/code/HEAD/tree/trunk/LibsIn/SceneEngine/include/ScEng/ImpExp/Obj.h
https://sourceforge.net/p/sceneengine/code/HEAD/tree/trunk/LibsIn/SceneEngine/source/ImpExp/ObjImport.cpp
Most probably the method:
Status WavefrontObjImporter::LoadObjFile(std::string filename)
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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.
PROJECT
=========================================================
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.
https://people.cs.clemson.edu/~dhouse/courses/405/docs/brief-obj-file-format.html
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.
---------------------------------------------------------
Deliverables
---------------------------------------------------------
Update the Obj Importer Exporter code to support OBJ negative indexes. The files that need to be modified are:
https://sourceforge.net/p/sceneengine/code/HEAD/tree/trunk/LibsIn/SceneEngine/include/ScEng/ImpExp/Obj.h
https://sourceforge.net/p/sceneengine/code/HEAD/tree/trunk/LibsIn/SceneEngine/source/ImpExp/ObjImport.cpp
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.
Ame T.
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Last project
27 Apr 2024
Canada
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