During the conceptual design phase, designers focus on developing a clear and concise concept that accurately represents the client's vision and goals. This concept could include elements such as the overall look and feel of the rendering, the intended mood or atmosphere, or specific design elements such as lighting or materials.

Once the conceptual design is established, designers can begin to create rough sketches or digital mockups of the rendering. This allows them to test out different ideas and refine the design before moving on to the more detailed rendering process.

Overall, conceptual design in renderings is crucial to ensuring that the final product accurately reflects the client's needs and is visually engaging and effective. It sets the foundation for the entire rendering process and helps guide designers in making decisions that will result in a successful final product.