Candela | iOS style brightness control view | iOS library

Been futzing around with the three.js library a bit this past week, and I ran into a problem applying transformations to loaded models (gltf). Whenever I try to update the rotation I get "Uncaught TypeError: Cannot read property 'position' of undefined." I'm very confused; it seems like I can only access the .position/.rotation attributes in onLoad?

I made a multiple choice game and tried to randomize the questions by using the shuffle method on my array which contains all my questions. The problem is that some questions are being constantly repeated, so you will see some questions two times, some you won't see at all. I thought that I could use a arraylist instead of an array, so I could use the remove method after a question has been asked, but I Always get Errors with the arraylist and I don't even know if my approach makes sense. You can see my problem under that big chunk full of objects, in the ShuffleQuestions method and the ShowNextQuestion method.

How would you go on about this problem? Thank you for your help!

Here's my Code:

Short version: When a color described in XYZ or xyY coordinates has a luminance Y=1, what are the physical units of that? Does that mean 1 candela, or 1 lumen? Is there any way to translate between this conceptual space and physical brightness?

Long version: I want to simulate how the sky looks in different directions, at different times of day, and (eventually) under different cloudiness and air pollution conditions. I've learned enough to figure out how to translate a given spectrum into a chrominance, for example xyz coordinates. But almost everything I've read on color theory in graphical display is focused on relative color, so the luminance is always 1. Non-programming color theory describes the units of luminance, so that I can translate from a spectrum in watts/square meter/steradian to candela or lumens, but nothing that describes the units of luminance in programming. What are the units of luminance in XYZ coordinates? I understand that the actual brightness of a patch would depend on monitor settings, but I'm really not finding any hints as to how to proceed.

Below is an example of what I'm coming across. The base color, at relative luminance of 1, was calculated from first principles. All the other colors are generated by increasing or decreasing the luminance. Most of them are plausible colors for mid-day sky. For the parameters I've chosen, I believe the total intensity in the visible range is 6.5 W/m2/sr = 4434 cd/m2, which seems to be in the right ballpark according to Wiki: Orders of Magnitude. Which color would I choose to represent that patch of sky?

I am making a app in which i want to view a html page in flutter using flutter_html_view plugin (LInK) I got an error here is the screenshot of the error message Error message screenshot here is the screenshot of the html HTML and here is the the flutter code

Maybe I'm just overtired, but I can't see why this simple code to calculate Planck's law isn't working.

I have the following issue:

• I want to make an Portfolio Grid with Videos
• The Videos should start, when the User is hovering over the Portfolio-Item & and it should stop, when is not above it

Problem I use Overlays to for adding colors and text to the Portfolio-Items. That's why the Javascript is not reacting.

Information: The Video at the bottom without Overlay is just there to show that the JS is working.

Thank's for ya help!!!

As per Weber's law, delta(L)/L is a constant where L is luminance measured in candela/m2 )i.e. (L2 - L1)/L1. This implies that a small change in lower luminance range (darker) is perceptually much more than a small change in higher luminance range (brighter).

The sRGB images which we have stored are gamma corrected i.e. they first undergo a non-linear transfer function which also partially simulated human perception.

I would like to know what happens to luminance masking after gamma correction? Does Weber law still hold on these sRGB images or are they perceptually uniform i.e. 1 unit of difference in pixel value is same be it in darker region or in brighter region? In other words, is delta(L) constant in gamma corrected images where L is gamma corrected pixel value.

I am puzzled as to why I have successfully created 3 tabs in my tabBox in my R shiny app, but the third one won't appear. I would like the third tab, "Visualize", to have the checkBoxGroupInput and ggplots. Here is my code:

I've got an activity called SI with GridView which contains units that take you to another activity on click. I would like to know how to get to the same activity that will just change its TextViews depending on which intent started it.