This repository includes the code for "Simple dynamic LOD for geometry images" published in GRAPHITE '06: Proceedings of the 4th international conference on Computer graphics and interactive techniques in Australasia and Southeast Asia.
The core clases are cGI in Include/gi.h and Source/gi.cpp, cGILod in Include/giLod.h and Source/giLod.cpp. The host code is in Source/main.cpp and relevant shaders are passthruTexVertex.glsl, distanceMipMapPixel.glsl and genLODSelectionPixel.glsl. 3D models for testing are encoded in C structures (male-25Textured.cpp, vaseTextured.cpp) and can be loaded by the ModelObject class.
Note our algorithm requires any 3D model to have a texture parameterization in such a way texture coordinates are unique for each vertex. In contrast, the original Geometry Image (GIM) technique and related algorithms implements stitching and calculate their own 2D parameterization to optimize GIM space, reduce model reconstruction distortion, etc.
If you use this code in a publication or project, a link to or citation of both, our paper and this repository, would be appreciated.
The BibTex entries for our publication and code are:
@inproceedings{10.1145/1174429.1174454,
author = {Hern\'{a}ndez, Benjam\'{\i}n and Rudomin, Isaac},
title = {Simple Dynamic LOD for Geometry Images},
year = {2006},
isbn = {1595935649},
publisher = {Association for Computing Machinery},
address = {New York, NY, USA},
url = {https://doi.org/10.1145/1174429.1174454},
doi = {10.1145/1174429.1174454},
abstract = {We present a new approach for dynamic LOD processing for geometry images (GIs) in
the graphics processing unit (GPU). A GI mipmap is constructed from a scanned 3D model,
then a mipmap selector map is created from the camera position's information and the
GI-mipmap. Using the mipmap selector map and the current camera position, some parts
of the GI mipmap are discarded using a one-pass shader program that selects the mipmap
level that must be displayed and calculates backface culling. Since our method does
not require any extra spatial data structure, conceptually it is very simple. Since
LOD selection is a one pass algorithm performed on the GPU, it is also fast.},
booktitle = {Proceedings of the 4th International Conference on Computer Graphics and Interactive Techniques in Australasia and Southeast Asia},
pages = {157–163},
numpages = {7},
keywords = {GPGPU, geometry image, dynamic LOD, GI mipmap},
location = {Kuala Lumpur, Malaysia},
series = {GRAPHITE '06}
}@misc{SimpleDLODGI_2006,
auhor = {Hern\'andez, Benjam\'in},
title = {Simple Dynamic LOD for Geometry Images},
year = {2021},
url = {https://github.com/benjha/simple-dlod-gi},
note = {\url{https://github.com/benjha/simple-dlod-gi}}}