I have a really simple question I cannot be sure about the answer.
What is the space of tangent (T), and bitangent (B) vectors when we calculate them using vertex positions, and texture coordinates?
Game Development Stack Exchange is a question and answer site for professional and independent game developers. It only takes a minute to sign up.Sign up to join this community
Assuming your vertices haven't been multiplied by any matrices the tangent and bitangent will be in object space.
Your vertices are in object space. A normal is a vector perpendicular to a face (usually a triangle made from 3 vertices). Because the vertices used to calculate the normal are in object space, the normal will be also. The same follows for the tangent and bitangent.