 Building integrated photovoltaics, BIVs, and vehicle integrated photovoltaics, VIPs, are both solar energy systems that utilize photovoltaic cells to convert sunlight into electricity. However, these two types of systems differ in their ability to capture solar radiation due to the presence of non-uniform shading objects such as buildings and cars. To address this issue, this paper proposes a new method for calculating the solar irradiance of BIPV and VIPV systems. It uses an aperture matrix to accurately calculate the horizontal and vertical planes affected by non-uniform shading objects. Additionally, the proposed method can be used to calculate the solar irradiance on a VIPV by applying a local coordinate system. The 3D model was validated with simultaneous measurements of five orientations, roof and four sides, front, left, tail, and right, of solar irradiance on a car body. Finally, the combined use of the 3D solar irradiance model is effective in assessing the energy performance of solar electric vehicles in various zones, including buildings, residential areas, and open spaces. This article was authored by Kenji Araki, Yasuyuki Oda, Akira Nagaoka, and others. We are article.tv, links in the description below.