pinholedefines

Pinholedefines is a naming convention used for a collection of constant definitions that parameterize pinhole camera models within software projects. It is not a formal standard, but a practical artifact found in simulations, computer graphics, and photography tools that implement pinhole optics.

The module typically aggregates constants describing geometry and imaging parameters. These can include the pinhole diameter, the distance from the pinhole to the image plane (analogous to focal length in a pinhole model), sensor or film plane dimensions, image resolution, and units. Some implementations also provide defaults for light transmission, vignetting factors, and calibration-related values. To support different scales, the definitions may separate physical sizes from pixel counts and include conversion factors between the two.

Common structure and usage vary by language. In C or C++ projects, a header file named pinholedefines.h might expose macros or constexpr values. In Python, pinholedefines.py could define module-level constants. The primary aim is to centralize model parameters so that the pinhole camera model remains consistent across rendering, calibration, and simulation components, and so that tuning the model is straightforward.

Typical usage involves a PinholeCamera component leveraging these constants to compute projection from 3D world coordinates to the image plane or to drive ray directions in a renderer. The definitions can often be overridden at runtime or through configuration files to explore different imaging setups without altering core code.

Pinholedefines commonly appears in open-source graphics engines, educational tools, and camera simulators as part of the broader pinhole camera modeling ecosystem, serving as a practical repository of default values and configuration hooks.