Bus to T-Rex Transformer

a matte black city bus with red accents racing along a forest road suddenly transforms into a massive robotic T rex, mechanical panels shifting and unfolding with sparks and debris, glowing red eyes and energy cores, the T rex opens its mouth and gently releases a human rider who climbs onto its back to control it, cinematic tracking shot, realistic metal physics, dust and smoke in the air, dramatic daylight, the robotic T rex roars and unleashes a burst of bright fire from its mouth, ultra detailed, high impact transformation sequence