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We develop the 3-dimensional general relativistic radiative transfer code:CARTOON (Calculation code of Authentic Radiative Transfer based On phOtonNumber conservation in curved space-time) which is improved from the2-dimensional code: ARTIST developed by Takahashi & Umemura (2017). In CARTOON,the frequency-integrated general relativistic radiative transfer equation issolved in a photon number-conserving manner, and the isotropic and coherentscattering in the zero angular momentum observers (ZAMO) frame and the fluidrest frame is incorporated. By calculating the average energy of photons,energy conservation of the radiation is also guaranteed. With the testcalculations in 2-dimensional and 3-dimensional space, we have demonstratedthat the wavefront propagation in black hole space-time can be correctly solvedin CARTOON conserving photon numbers. The position of the wavefront coincideswith the analytical solution and the number of photons remains constant untilthe wavefront reaches the event horizon. We also solve the radiative transferequation on the geodesic reaching the observer's screen. The time variation ofthe intensity map on the observer's screen can be simultaneously andconsistently calculated with the time variation of the radiation field aroundthe black hole. In addition, the black hole shadow can be reproduced inmoderately optically thin situations.

3D Photon Conserving Code for Time-dependent General Relativistic Radiative Transfer : CARTOON