Photorealistic rendering of 3D models – CGI (Computer Generated Image) and the use in e-commerce.
Photorealistically rendered images are computer-generated image data obtained from 3D models. A previously produced 3D model is loaded into the working environment of the 3D software and provided with the corresponding materials.
In the 3D segment, materials are defined as the color and surface properties. This includes the structure, gloss and reflectance of the object to be rendered. These materials and the scene settings of the renderer, i.e. the software that simulates the physical parameters of the object, ultimately ensure that the image looks as realistic as possible. The post process in common image editing software such as Photoshop then rounds off the image.
The use of 3D models is increasing in every conceivable area. Be it in the planning of buildings, the construction and design of components and products. Image data and 3D models are often used for in-house presentations.
But above all, CGI images are increasingly being used in product presentation for advertising, film and print. Industry giants such as Otto and Ikea recognized the potential of 3D models for use in e-commerce at an early stage and already use computer-generated images in the majority of their catalogs.
The head of the CGI Content Lab at Otto, Tobias Nientiedt, explains the move towards more CGI by saying that the digitalization of the content production process gives customers more scope to show multiple photos in different versions and configurations.
In many cases, a model is produced specifically for this purpose.
However, CAD data from the design department can also be used. The advantage of using CAD models as the basis for CGI images is obvious. The customer already has a 3D model and this does not have to be produced separately. These only need to be optimized and textured for this use.
In addition to the manual creation of a model, objects can also be scanned and prepared for visualization. In addition to 3D laser scanning, photogrammetry is also used in some cases. The advantage over the accuracy of laser/structural light scanners is that the texture is placed on the model in the form of a photo. It is therefore the highest quality and most realistic type of texturing in the optical measurement process. The disadvantage of photogrammetry is that no real dimensions of the object can be recorded.
The logistical advantages of computer-generated product images over classic product photography are obvious. Goods do not have to be elaborately packaged, shipped and insured. With just a few clicks, the settings of the virtual photo set can be adjusted and saved permanently so that subsequent orders can also be carried out quickly with consistent quality. Changes to the product, such as colors or accessories, can be quickly coordinated with the customer and implemented. The model is saved permanently and can be loaded into special applications as required and used, for example, to compose a 2D image. The possibilities are almost unlimited.
