We introduce 3DThermoScan, a proof-of-concept method employing a single camera for full 3D thermal reconstruction, i.e., joint geometry and temperature recovery. Most existing approaches rely on infrared– visible camera pairs, requiring cross-system calibration and strong assumptions on surface emissivity. Our method instead inverts a unified image formation model that accounts for both reflection and emission, thereby overcoming these limitations. From images captured under controlled active lighting, 3DThermoScan integrates photometric stereo and thermoreflectometry to estimate surface normals, albedo, and radiance temperature. With Lambertian reflectance as the only optical assumption, we recover surface emissivity and true temperature from these estimates, and map them onto the 3D model. Preliminary experiments on synthetic and real diffuse surfaces with diverse geometric and thermal properties demonstrate both the accuracy and robustness of our approach, as well as its potential.