Post 227 – by Gautam Shah
A user perceives a material-object in many different ways like: Engineering attributes, Dimensional features, Surface properties and for Other considerations.
A surface is the most proximate and tangible part of an object. A surface, is often the reason, why an object continues to survive in a particular setting. A user perceives the surface of a material-object through factors such as:
- proximity (closeness, intimacy, distance)
- duration (of encounter)
- frequency and extent (area) of contact
- mode of handling
- our past experiences
- our sensory capabilities
- our physiological state
- atmospheric conditions (temperature, humidity)
- light (direction and level of illumination)
- orientation, or point of observation.
There are more than 20 mathematical parameters applied to surface description, and some of the terms are: roughness, irregular features of wave, height, width, lay, and direction on the surface; camber, deviation from straightness; out of flat, measure of macroscopic deviations from flatness of a surface.
Surface Finishes have three main cognitive affectations: Colour, Pattern and Texture. Colour and pattern, are visual recognition, whereas texture has visual and feel affectations. Texture profoundly alters the perception of colour and pattern. As a combined effect of all the three factors, it is impossible to duplicate a surface finish. Cognition of a surface finish is a subjective phenomenon, which cannot be expressed truthfully.
A surface finish is a continuously varying entity, by processes like ageing, weathering, readjustment of stresses, and intrinsic physical and chemical changes. A surface finish is inherent with the material object or is an applied component. Applied components are affected by the behaviour of their base objects.
A surface finish visual appeal also changes depending, on the quality of light (spectrum range), angles of incidence, brightness, contrasts with background or surroundings. It is also impacted by dilation of a pupil, biological capacity to recognise colour, capacity to focus, and many other visual abilities.
The Patterns in natural objects result from granular or fibrous orientation, method of cut, cyclic nature of growth, formation of residual products, deposition of contaminants, and tools-techniques of handling and processing. The patterns over objects are enhanced by simple processes like washing, cleaning, polishing or roughening the surface, Surfaces are altered by little more complex procedures like sintering, acid-alkali treatments, chipping to expose an underlying surface or by sectioning. Patterns are also created by forming joints and use of distinctive joint materials and their profile forming. For many products patterning and colouring is a secondary process.
The textures primarily result from the degree of homogeneity, angle of cut, differential weathering, and stresses. Textures for manufactured objects are pre-set in the process of moulding, extrusion, shrinking, stretching, curling, twisting, spinning, weaving and forming, etc. Textures become apparent in the presence light and its incidence. Textures are more perceptible in reference to the shadows, which are more enhanced on lighter colours than darker faces. Textures are visible when one is nearer the surface; a little distance away it just seems a varied shade of colour.