A number of actual physical features in the geometry can contribute to provide the illusion of grunge materials, between them are:

Surface dents and bulges
Chips and cracks
Wear and tear on edges and corners
Folds and wrinkles Reflective Dog Vest 

While it is an excellent idea to use bump and opacity maps to create the illusion of geometry as normally as possible, it is sometimes necessary to construct these imperfections in to the mesh geometry. You can use mesh modifiers this kind of as Noise and Mesh smooth to distort the edges of objects, or use Boolean operations to create major cracks and crevices, for example.

Such major features are just too large for being handled nicely by the bump and opacity maps. Your 3D app provides some great tools to obtain you on your method to roughing up your mesh objects, this kind of as:

Extended Primitives for chamfering and filleting edges.
Mesh smooth modifier for rounding edges.
Relax and Spherify modifier for rounding objects.
Ripple and Wave modifiers and Space warps for rippling surfaces.
Noise modifier for random surface area perturbations.
Displace modifier for perturbations based on picture luminance.
Affect location modifier for dents and bulges.
FFD modifiers and Space warps for molding surfaces.

Not all material manipulations must be on the harmful side. You can greatly improve the look of highly reflective materials by adding objects in the scene-not for being noticed directly, but for being reflected. Simply retain them out of the collection of sight.

Adding Grunge to Materials: after you have your mesh item roughed up at the geometry level, you must include the fine detail that makes the surface area look real. a few of the grunge may be bold whereas some other may be subtle. It is very crucial that you include at the least certainly one of the consequences detailed here to all materials, however, to refrain from the homogeneous plastic look. various possibilities for grunge are:

Smudges and discoloration
Scratches and weathering
Puddles and variations in reflectivity
Dust and grime.