DVRlib: A C++ library for geometric mesh improvement using Directional Vertex Relaxation

Ramsharan Rangarajan; Adrian Lew

doi:10.21105/joss.02372

DVRlib: A C++ library for geometric mesh improvement using Directional Vertex Relaxation

The Journal of Open Source Software ◽

10.21105/joss.02372 ◽

2020 ◽

Vol 5 (52) ◽

pp. 2372

Author(s):

Ramsharan Rangarajan ◽

Adrian Lew

Keyword(s):

Geometric Mesh ◽

Mesh Improvement

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Simulation and Analysis of Floodlighting Based on 3D Computer Graphics

Energies ◽

10.3390/en14041042 ◽

2021 ◽

Vol 14 (4) ◽

pp. 1042

Author(s):

Rafał Krupiński

Keyword(s):

Computer Graphics ◽

External Surface ◽

Geometric Model ◽

Three Dimensional ◽

Fold Increase ◽

Luminance Level ◽

Object Model ◽

Geometric Mesh ◽

Average Luminance ◽

To Receive

The paper presents the opportunities to apply computer graphics in an object floodlighting design process and in an analysis of object illumination. The course of object floodlighting design has been defined based on a virtual three-dimensional geometric model. The problems related to carrying out the analysis of lighting, calculating the average illuminance, luminance levels and determining the illuminated object surface area are also described. These parameters are directly tied with the calculations of the Floodlighting Utilisation Factor, and therefore, with the energy efficiency of the design as well as the aspects of light pollution of the natural environment. The paper shows how high an impact of the geometric model of the object has on the accuracy of photometric calculations. Very often the model contains the components that should not be taken into account in the photometric calculations. The research on what influence the purity of the geometric mesh of the illuminated object has on the obtained results is presented. It shows that the errors can be significant, but it is possible to optimise the 3D object model appropriately in order to receive the precise results. For the example object presented in this paper, removing the planes that do not constitute its external surface has caused a two-fold increase in the average illuminance and average luminance. This is dangerous because a designer who wants to achieve a specific average luminance level in their design without optimizing the model will obtain the luminance values that will actually be much higher.

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