  Projection mapping (PM) is a technique that enhances the appearance of
real-world surfaces using projected images, enabling multiple people to view
augmentations simultaneously, thereby facilitating communication and
collaboration. However, PM typically requires a dark environment to achieve
high-quality projections, limiting its practicality. In this paper, we overcome
this limitation by replacing conventional room lighting with heterogeneous
projectors. These projectors replicate environmental lighting by selectively
illuminating the scene, excluding the projection target. Our contributions
include a distributed projector optimization framework designed to effectively
replicate environmental lighting and the incorporation of a large-aperture
projector, in addition to standard projectors, to reduce high-luminance emitted
rays and hard shadows -- undesirable factors for collaborative tasks in PM. We
conducted a series of quantitative and qualitative experiments, including user
studies, to validate our approach. Our findings demonstrate that our
projector-based lighting system significantly enhances the contrast and realism
of PM results even under environmental lighting compared to typical lights.
Furthermore, our method facilitates a substantial shift in the perceived color
mode from the undesirable aperture-color mode, where observers perceive the
projected object as self-luminous, to the surface-color mode in PM.
