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Questions tagged [light]

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1 vote
1 answer
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Is the light emitted by a typical white pixel actually a blue-ish purple to compensate for our greater sensitivity to the color green?

The human eye is considerably more sensitive to green light than red or blue; this is expressed in formulae which calculate an approximate overall "luminance" value for a RGB color (example)....
jameswilddev's user avatar
2 votes
1 answer
49 views

Direct Light Sampling produces way too bright images compared to naive diffuse bounces only

it's me again! :D I have finally implemented area lights, but without modifying the emission value of the material, this is what it looks like with indirect light only, this is what it looks like with ...
Syrinxos's user avatar
0 votes
1 answer
109 views

Lambertian surface and the luminous intensity

I am currently studying the basics of photometry to better understand the rendering equation of Kajiya. One thing I'm currently struggling with is Lambert's cosine law. Let's go over the premises: A ...
Bartolini's user avatar
2 votes
1 answer
193 views

How is Aperture and Pixel Size accounted for in calculating received power using ray tracing?

NOTE: Deleting the question to rephrase it after continuing to read other responses and toy around with it: I've written a path tracer and am now working on implementing a physically accurate way of ...
Chris Gnam's user avatar
0 votes
1 answer
82 views

light spectrum reflection / absorbation?

I would like to know how material works with respect to light. first of all, I've a lightsource e.g. the sun. The sun has a spectrum like figure1 Figure1 When an object is illuminated by the sun, how ...
Thomas's user avatar
  • 1,265
1 vote
0 answers
98 views

Sampling Quad Shape Light Using Spherical Rectangles in Local Space

The paper "An Area-Preserving Parametrization for Spherical Rectangles" describes an efficient approach for sampling solid angles for rectangle light sources. I am wondering if The light ...
ali's user avatar
  • 740