Don't Guess! The Map Range Node Visualized in Blender

Рет қаралды 30,395

Күн бұрын

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@kebrus 3 жыл бұрын

I want to point out two small mistakes and one important omission on the video. I know you said the visualization wasn't completely correct but I still think it's worth pointing out that the drivers setup and explanation lead into a math mistake. The first mistake is at around 5:00, you say how by having the "From Max" at 0.5 makes the input max value (which is at 1 in the example) turn into 1.5. This is wrong, it's exactly 2. I didn't checked the drivers setup to see what is wrong with it but most likely the math is wrong there. The way that node works means that a value range of [0, 0.5] becomes [0, 1] which means that by extrapolating the range [0, 1] should go exactly to [0, 2]. The second issue is with the clamp explanation. Clamp does not limit the value between 0 to 1 and it doesn't has anything to do how the principle BSDF or stuff like that. Clamp limits the output to the "to min" and "to max" values, so it happens at that point in time in the explanation the values are indeed 0 and 1, but if values were -1 and 2 it would clamp to those instead so you could still mess up any other following node configuration by having values outside of the "allowed ones". The reason clamps is sometimes useful is related to my final point and critique of your omission. Finally, one omission is the explanation of the first parameter of the node, if you click on it is says "interpolation type" and throughout the whole video you have it at "linear". Interpolation is a math operation where you guess the "inbetween" values of something using a mathematical equation. And linear is just the type of equation used, linear here means that values travel from and to, well... linearly, if you want to picture this using this video example it would mean that you would connect the from and to, min and max value with a straight line, not with a curve, in fact, one of the options in the interpolation type list is "smooth step" which uses a hermite interpolation equation which actually resembles the curve the video shows. So basically throughout the whole video you are showing a preview of the operation more closely resembling the smooth step type while having the node and actual texture preview using the linear mode. And the reason I said this was related to my second point is because the math being done here can actually calculate the value outside of the provided range, this is called "extrapolation", so by having clamp turned off imagine having the blue curve continue in whatever direction it was before reaching the "to" values which sometime leads to unwanted results, that's when clamp comes in hand. my two cents, the video is still good helping explaining visually what the node does, I just wanted to share these corrections in case someone stumbles across issues with them cheers

@Edgard422 3 жыл бұрын

I was wondering why the value just went up to 1.5 instead of 2, I was assuming he was right and that the node just "stretchs" everything between the range ("map range" made sense) and that it only offsets everything outside it. I was then confused when he told that the outside values were extrapolated, so I didn't know what to believe. I hope they can reupload this video with the correct explanation.

@zetsology 3 жыл бұрын

Sounds logical. In your opinion, what is the best place to start learning math again, online, and at the same time understand how to apply it in Python and maybe even nodes? I really feel like I have missed a lot or at least forgot a lot. Thanks.

@cg_cookie 3 жыл бұрын

Thank you for the thorough corrections! You are right - my equation for the drivers was incorrect. I may reupload with corrections in the future, but in the meantime I'll pin this comment so that it's the most visible.

@kebrus 3 жыл бұрын

@@zetsology I'm not a good person to give such information, I know this stuff because I learned how to code my own shaders and then later on applied that to more complex situation, more specially in creating node based editors. In those two environments linear interpolation is actually very common so my eye is "trained" to it, hence why I noticed the issues in the video. There's a ton of good information online about shaders and about python however something specific like you want seems more difficult, at least to me. If would give any advice it would be to start a small project (1 or 2 weeks of time) and research everything you need for it. Just the act itself will set you in the path of getting the information and knowledge you seek, you can then move on to something progressively more complex. not sure if this helps in any way :\

@zetsology 3 жыл бұрын

@@kebrus thanks for taking time to answer. Take care.

@diegopadovani4942 3 жыл бұрын

I am mesmerized how you made the realtime graph... amazing.

@lightmanleaf3761 3 жыл бұрын

I have been puzzled by this node for a long time. You saved me!

@husainbadi8333 3 жыл бұрын

dang this is a good video! the presentation make it a lot easier to understand!

@ЭрикКарапетян-в5в 6 ай бұрын

Thank you for this cool lesson and for this beatiful visual demostration

@GenericInternetter 3 жыл бұрын

I've been using Map Range for ages now, it is truly the most underrated node imo

@rsher_digital-art 3 жыл бұрын

a great illustration of this node.

@ombra30 Жыл бұрын

really nice as visualizer. it's useful for me as i just started

@martinconstable5911 2 жыл бұрын

Excellent work!

@brk5590 2 жыл бұрын

Great explanaition. Thanks

@hamishmctiaigh4363 2 жыл бұрын

Brilliant explanation mate, thank you!

@ThadeousM 3 жыл бұрын

thank you mate, very clear. Map range reminds me of After Effects Linear Expressions

@sycomorah1380 2 жыл бұрын

Very useful! Thank you

@wakegary 3 жыл бұрын

Thanks. I was guessing.

@jerryhunter1114 8 ай бұрын

Had to go back a few times, but def worth watching. Totally get it......mostly lol

@balinthonvari7723 Жыл бұрын

Thank you so much!

@SnowInHere 6 ай бұрын

ahh, now I understand. thanks for making this video

@GerardMenvussa 3 жыл бұрын

First time I even hear of this node. When was it added? :o

@himoplayer1959 3 жыл бұрын

If you have a random spots of 0 value like for example a voronoi texture ran into a greater than, how can you make it smoothly transition between the black value to white?

@ColinPaddock 3 жыл бұрын

Check the image in this link. I think you’ll find “smoothstep” is your friend. twitter.com/bartekmoniewski/status/1229063557330984960?s=21 Also this: www.shadertoy.com/view/ldB3zc , and this: www.iquilezles.org/www/articles/smoothvoronoi/smoothvoronoi.htm

@himoplayer1959 3 жыл бұрын

@@ColinPaddock thanks for the useful resources, but that is not exactly the issue I wanted to address. My question was if you have only 0 and 1 values without falloff in ununiform pattern, how could you create a falloff between them?

@cg_cookie 3 жыл бұрын

@@himoplayer1959 I don't really think you can, without getting pretty hacky. I sometimes cheat by taking the vector coordinates and linear light mixing a white noise texture to make it appear blurred.

@ian.ambrose 3 жыл бұрын

@@himoplayer1959 Sorry for late comment, as you said there is only number 0 and 1 on the surface (because of the Greater Than's output), it means there is no other numbers between 0 and 1 (0.000...----> 0.9999...) available to create said fall off. And since they are not available, you will have to manually generate those ''fall off numbers'' to achieve the smooth transition effect.

@johndc7446 3 жыл бұрын

I guess it would be nice to have an optional 2 row map range node: FROM: (min:0.0 | max:1.0) TO: (min:0.0 | max:1.0)

@ian.ambrose Жыл бұрын

Yeah the 2 rows is more intuitive than the 4 rows we have now.

@jkl3201 3 ай бұрын

good! thx

@InvasiveAlienPlants 3 жыл бұрын

genius! I'm curious about a case that min value is bigger than max value. I saw someone use that values editing displacement in cycles

@cg_cookie 3 жыл бұрын

That will flip it and make the values appear inverted. It's a handy trick!

@FCR3399 2 жыл бұрын

so im trying to import a map and while i zoom out it just goes gone

@Qu1_qu3_TTV Жыл бұрын

hi i know a lot years have passed since the video, but how did u the interactive graph there? i would like to know how to do that to see real time math models like functions along the time and things like this in b3d if u can answer ill be gratefull best regards ty

@cg_cookie Жыл бұрын

The secret is drivers! An example of that workflow is here: kzbin.info/www/bejne/hWWpgIiqeL2inbs

@Qu1_qu3_TTV Жыл бұрын

ty@@cg_cookie

@pseenazloy6409 2 жыл бұрын

What if you don't know your FROM values, and you want to compress this whole unknown range to 0...1 (not clamp, but compress)?

@ian.ambrose Жыл бұрын

There's no way you don't know the From value, just observe the values. You actually don't have to input the correct From values, if you input any value, Map Range will register that value and start interpolating.

@pseenazloy6409 Жыл бұрын

@@ian.ambrose yes, I wasn't thinking enough

@darrenberkey7017 2 жыл бұрын

I must not be cut out for Blender stuff, because even when someone draws a picture for me on how something works, I still don't understand. 🤔

@minhchauo1279 3 жыл бұрын

Can i download this file

@usomat5447 3 жыл бұрын

Hey Cookie-Team, im a citizen and i would like to build the rolls royce i see on the "Moving from 2.7 to 2.8" course. I couldnt find a course to model that car though. Can you help me out?

@quanli3552 2 жыл бұрын

What if you don't know the bound of the data?

@allinoneentertainment7499 3 жыл бұрын

Hit me hard. If i understand a single word in this videoo...😭

@mcan-piano4718 3 жыл бұрын

I didnt understand too. I have a easier explanation for you :) Map range node is same as color ramp. Once I made color ramp node by using maths to expose inputs, so those 4 values actually illustrate, 1)blacks color intensity, white color intensity, the position of black color on color ramp and position of white color on color ramp.

@bzikarius 3 жыл бұрын

No point to understand, explanation is wrong.

@cauanorbiato1713 9 ай бұрын

I cannot understanding anything reading blender documentation. This way is much more easier to understand, because I can visualize what happening.

@drumboarder1 Жыл бұрын

The shirt makes this a total comedy EDIT: invaluable but comedy nonetheless

@indibarsarkar3936 Ай бұрын

Could you tell me how it isn't 100% accurate?

@kayquecavoli6313 3 жыл бұрын

What is use this?

@sforzz 3 жыл бұрын

well, sound a bit strange)

@wycliffe_ndiba 3 жыл бұрын

😂😂I feel targeted.

@cg_cookie 3 жыл бұрын

Lol that wasn't intended...much

@Mike-Bell 2 жыл бұрын

Base is crazy high. It was too overwhelming to finish waching

@nspidel 3 жыл бұрын

Am I wrong in thinking this just seems like a more convoluted and less powerful curves node? It didn't seem like you did anything with this node that couldn't easily be done with curves in a much more intuitive way.

@ian.ambrose 3 жыл бұрын

You can't set keyframes and animate with curve node. But you can with map range.

@nspidel 3 жыл бұрын

@@ian.ambrose ah!! Right, okay that makes perfect sense actually. Great observation.

@gradynelson 2 жыл бұрын

the explanation itself is harder for someone who wants to understand the node and i mean this is really not the best idea trying to explain something to someone who didn't get it in the same logic they didn't get before.