Optimus Prime as a 3D model would be a towering, heroic robot standing around 30 feet tall, with a humanoid structure but distinctly mechanical features. His body would be composed of sleek metal plates in vibrant red and blue, with detailed textures mimicking the rugged surface of a well-used vehicle. The chest area would prominently display a semi-truck's front grille and headlights, while the arms and legs would be built from various mechanical parts such as pistons, gears, and exhaust pipes.
His head would be crowned with a helmet featuring a metallic faceplate and glowing blue eyes, symbolizing wisdom and leadership. The faceplate would retract to reveal a more humanoid expression. The model would also include articulated joints, allowing movement in the arms, legs, and torso, mimicking the transformation process between robot and vehicle mode.
Details like wires, bolts, and hydraulics would be visible at joints and behind the armor plates, giving a sense of complexity and realism. The 3D model would have weapons attached, such as a large, glowing energy sword or a heavy ion blaster, ready for combat. The overall aesthetic would be one of strength, power, and nobility, with attention to the balance between the mechanical design and a heroic, larger-than-life presence.