Final answer:
3D modeling includes additive manufacturing, where material is added layer by layer, and subtractive methods like carving, where material is removed from a solid block. The use of CAD has transformed both processes, providing a platform for detailed virtual modeling.
Step-by-step explanation:
Types of 3D Modeling
3D modeling can be classified primarily into two types: additive manufacturing and subtractive processes. Additive manufacturing, commonly known as 3D printing, involves the layer-by-layer creation of objects. Materials such as polymers, metals, and ceramics are deposited in consecutive layers to build up the final shape of the model. This process allows for complex geometries and is prominently used for creating prototypes, medical devices, and even final products.
Contrarily, subtractive modeling comprises methods such as carving, where material is systematically removed from a solid block using tools like chisels. Subtractive processes are traditional and have been used for centuries in materials like stone and wood, making them suitable for creating durable works of art and functional items.
Moreover, the advent of CAD (computer-aided design) software has revolutionized 3D modeling by providing tools for creating detailed virtual models that can be used for visualization, simulation, and ultimately guiding the manufacturing process whether additive or subtractive.