I´m reviving this topic because I would like to have shadows casted over a photogrammetry taken environment, with this I mean a full environment with it´s shadows on it, I don´t like to calculate all the lighting of the environment.
What I would like to do is to have that “unlit” environment, but if I place an object, it would cast shadows over the environment (I don´t care about shadows not being perfectly mixed with the environment shadows), those would be real time shadows not baked shadows, and the environment don´t have to be lit at all, just catch the shadow of the object casted by a real time light.
Can this be done? Specially now that we have forward rendering? (this is for VR)
I´m on a struggle here and I don´t know what to do.
I tried using a normal material with everything at 0 but it won´t catch shadows, I tried using the same texture for emmisive and base color but multiplied by 0.5 so I can get some shadow, but then the environment it´s also affected by light.
In short, what I need is a material that can catch shadows casted by objects but that is not affected by lights, is the only way to recreate something in photogrammetry and mix with 3d objects properly.
Help please, I´m totally lost here.
Thanks in advance!