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# Having trouble implementing photon mapping

By : user2949075
Date : November 16 2020, 06:23 AM
wish helps you First, thanks a lot for all your help.
Second, I'm here to announce that after some trouble and after a period in which I didn't touch the code, I finally got it.
code :

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## Implementing Nhibernate one to many mapping

By : sterling
Date : March 29 2020, 07:55 AM
like below fixes the issue Try this:

## Rendering equation for Photon Mapping

By : D.CUI
Date : March 29 2020, 07:55 AM
it helps some times For your first question, the answer is yes. A BRDF is just a probability distribution that describes the probability that a photon with incident direction i gets reflected toward a direction o (or gets absorbed). That's what your Phong model describes as well.
For your second question, I guess your problems lies in the scaling factor. When you gather the photons in a neighborhood of radius R (whether R is constant, or varies with the k nearest neighbors), you have to divide your cumulated energy by the area of the disc of radius R (and as such, if this area is much less than one, this will boost your intensity). Appart from that, your calculation seems correct : you take all photons with their direction, use them in the BRDF to see the probability that they get reflected toward the camera (or said otherwise, how much energy of the photon remains when reflected toward the camera), and sum everything. I guess your Phong_Diffuse contains a diffuse component (hence its name), and if so, that is correct as well.

## I'm having trouble installing TestNG on eclipse Photon Release (4.8.0), OS-win10, java version 10.0.2

By : Eleven
Date : March 29 2020, 07:55 AM
I wish this helpful for you It was just a temporary ISP outage, http://testng.org is back up.
The project is alive and well, and we're busing working on the next major version.

## Implementing 1 to n mapping for ORM c++

By : siva
Date : March 29 2020, 07:55 AM
around this issue My first idea would be to encapsulate all possible db operations as command objects (Command pattern). This way you can create as many commands as you want until you call the Save() method to update the database. Here you need to ensure that these commands are handled as transactions. A quick implementation would be something like this: