Lighting and Rendering

 

Two theories of light: Prismatic and pigment Prismatic: light and how it is reflected Pigment: colors reflected by pigments Color wheel divided into cool and warm tones Cool colors have blue base and warm colors have red base White-purity, cleanliness, used as an accent Black: associated with darkness, evil and night. Sophistication Red: fire, passion, anger, irritation Pink: light sweet and takes away the power of red Yellow: Happiness, sunshine and light, heat and dryness Gold: wealth, luxury and charisma Blue: nature, sky, night and ocean, peace and distance Green: mixture of yellow and blue, nature, growth and freshness Orange: mixture of red and yellow, has passion of red and cheeriness of yellow Peach: a tint of orange, cheery Brown: shade of orange, mother earth, earthy, stable Purple: mixture of red and blue, dignified color, can be very depressing Gray: neutral, can be tinted warm and cool Silver: a variation of gray, neutral Simplify by using color themes and color chords Col...

Art Of Color Color effects are in the eye of the beholder Genius is 99 percent perspiration and 1 percent inspiration  Color theory was not taught but rather thought to be part of the artist In China the sense of color became cultivated as colors become more naturalistic and ceramics evolved new glazes Mosaic artists were able to produce complementary colors Grey light was achieved by bathing the blue mosaic walls of the interior in an orange light, filtered through narrow windows of orange alabaster Orange and blue make grey as they are complementary colors Early stained glass only had few colors Romanesque and early gothic artists wanted very bright colors to use as symbols Giatto and sienese school were the first painters to paint the human figures in color Hubert and Jan Van ecky painted humans realistically Color became a means of characterizing natural objects el Greco was considered a progenitor of non objective categories The art of the empire and classical periods colorati...

 

 

 

 

 

  What is Sampling Producing realistic looking scenes require lighting and camera work Sampling means to collect information from the geometry, lighting, and shader which then which then creates light transport paths that connects it to the pixel through the light sources Quality of the pixel depends on how many paths it has Arnold sends out numerous amount of rays at a scene to determine things like color of the pixel Increasing the number of samples result in less noise The camera value controls the pixel sampling rate It is important to identify the source of the noise so that those specific rays are increased Light sampling is using rays to that deal with light It is more difficult to identify the source of noise for light especially if the light is large Noise from direct light sources appear in specular highlights and in soft shadows Indirect diffuse rays interact with objects and their shaders Direct diffuse rays are random When dealing with specular rays, turning the specul...

  Rembrandt van Rijn (1606-1669) The light is coming from the left, shining directly on the left cheek This results in heavy contrast on the right side of the face The contrast can be seen on the hair as well Strokes of the hair is light and in different values of orange to make it look soft and fluffy Skin is porcelain like and the light lays on it more strikingly compared to the hair  Johannes Vermeer (1632-1675) Lighting is on the left side meeting both whites of her eyes Textures of different fabric is displayed through the ways the light hits the material The right hand side is mostly dark with a sliver of white and grey values to represent the pearls This is done with high contrast to make it more striking The whites of the girls eyes are similar to the pearl earrings Majority of the fabric on the right side is in dark values except for the yellow topknot like fabric Jean Auguste Dominique Ingres (1718-1867)  Lighting in the painting brings out the textures of the f...