Questions tagged [pdf]

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PDF for sampling emissive meshes for NEE/MIS

I'm writing a Monte Carlo path tracer, and I'm trying to allow any mesh to be an emitter, but I'm not entirely sure about the probabilities to use when I sample them. Right now, my algorithm for light ...
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36 views

How can I step through a pdf file while maintaining a fixed viewport for each page?

I have developed some software that generates a pdf file for visualizing air traffic. Each page shows a plan view of the traffic at a point in time, with a small time step (e.g., 20 seconds) from one ...
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68 views

How can I make the simplest physically based mixed specular-diffuse BRDF (and how to properly sample it)?

I am having troubles making a BRDF that has both specular and diffuse part. Each one is weighted by a coefficient and the sum of coefficients should be equal to one. I want this layered BRDF to be the ...
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82 views

How to find the importance sampling function for a specified BRDF?

I am currently working on BRDF and their associated probability density functions (PDF) in order to importance-sample them. It is really hard for me to find the correct way to compute the PDF of a ...
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28 views

Do scanners and scanning software compensate and enhance blurry sources?

I received a pdf from a client containing several invoices. Upon further inspecting, some lines on the invoice seem digitally produced. When I tried selecting the page, copying it then pasting it on ...
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73 views

Why isn't the 'Map Colors' fixup changing text colors?

I saw this question some where, I think Reddit, but I can't find it. I have same issue. Please see the screenshot beneath. I've uploaded the PDF to mega.nz I'm using Adobe Acrobat Pro DC Version 2019....
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43 views

An equation about PDFs and differentials in the book of pbrt-v3

Why does the equation at the bottom of the following page hold? http://www.pbr-book.org/3ed-2018/Monte_Carlo_Integration/Transforming_between_Distributions.html $p(\theta,\phi)d\theta d\phi=p(\omega)...