Blender Archviz Tutorial: HDRI Setup | 3D Interior Visualization Course: Part 22 |

if you look at the references linked to our project you might think well setting up the global lights the let's say global illumination is not that hard it seems pretty flat to be honest it's just white light coming from behind the windows but if you look closer at the stairs for example you can see there are actually pretty complex shadows visible in this area same as when you look at the staircase there is a very interesting shadow coming from those elements here this might be caused by the sun this might be caused by the lamps used by the photograph but anyway i think it's pretty interesting effect and it would be interesting trying to get the same effect in our scene so let's see what we can do in terms of setting up the global lights themselves to create the most most basic global light setup we simply go to this icon here or we can also in the shader editor go to this little section here and change the object settings to world and as for now you see nothing here but as soon as we click use notes button there is this very very simple node setup visible and you can see the default color for some reason is 25 white or gray let's just switch to the rendered view and see what it does it's basically this very dark image what we have so by increasing the color to 100 you can see an instant change and well at least we have some light right now however if we disable the staircase elements from the view and i'm pressing ctrl b and selecting this region here just to see it closer when we move to this nice interesting stair area you can see there is very little shadow happening if we even if we increase the strength of the global light to 5 the shadows somehow are visible maybe in the upper section here but there are very diffused and very different to nice vibrant shadows we have here so what is a solution to this problem the easiest way to cast those kind of shadows would be adding an extra light source to the scene but that makes things a bit more complicated perhaps it is possible to create this interesting effect by influencing by changing the global scene background settings themselves so there are two approaches to that we could try to create blender only node setup or we can use hdr image which i also have covered this topic in one of the chuck for tutorial tutorials it will be linked below this video but let's just see if we can recreate this kind of setup for our scene and check the results it gives so i'm going use choco for hdr image05 which will be also linked below the video as you can see it is this cloudy weather kind of scenario with a little bit of light coming through the sky through the clouds but in general this should gives us uh this very diffused white kind of gray illumination similar to what we have here in the scene so to begin the setup first we need to go to the node editor here i'm gonna press shift a go to the texture and select environment texture node i'm gonna place it somewhere and link it to the color source now when i go to the rendered view immediately this will be the effect and you should be getting familiar with this color because it indicates that there is no texture in the source of the color somewhere around the scene so since this is a global illumination and there is no texture it paints everything with this kind of light so let's now load an environment texture i'm going to my folder and selecting the lower resolution lr version of the texture because we don't need actually a high resolution image for a decent looking illumination setup let's now switch to the rendered view again and the results should be visible instantly almost instantly so as you can see this is something an hdr map is available it's able to generate simply by plugging it in as a background color you need to remember i'm gonna go to wireframe view you need to remember that it has to be a environment texture not an image image texture used as a color source for the background because otherwise it's not going to work you're going to have a very flat image without any realistic illumination and you might be thinking you're doing something i mean you might be thinking you're doing everything correctly but the truth is that's a common mistake for people who are just starting with uh interior or architectural visualization in general so please keep in mind we need to use environment texture here so let's get back to our preview again and if your viewport is quite slow as in my case especially when i'm recording this video you might see the mouse cursor is jumping sometimes we might consider changing some of the performance settings here so a bit slower i went to the rendering settings the same place where we switched ev rendering engine to cycles then i scroll down to the performance tab and here if we close everything yeah we have to go to the viewport settings so performance viewport and we can change the pixel size to half of what it is normally meaning meaning it will simply render just a bit faster but the image preview we have is a little bit more blurry and the reason it's blurry is because blender divides the normal standard one uh standard resolution of what you see in your viewport and it divides it by two by four by eight so it's natural it becomes blurry but it doesn't mean we cannot set up the lights correctly with this kind of preview because we need a general information how the scene looks more or less i would say uh keeping the setting of two is enough it should work uh even on the slower computers but if necessary you can even go lower down to eight okay since we already added our hdr map let's see what else we can do with it it would be interesting when i go to the uh outside of the interior you can see our scene by the way in this way it would be interesting to see how the interior looks if we rotate the texture the background texture and try to cast the light from a bit different angle so in order to do that we need to create a quite simple node setup and i'm going to begin by pressing shift a again going to input and texture coordinate so i'm gonna put this node here and plug the generated input to the vector node here now i'm gonna move the node here to make a little bit more space i'm gonna press shift a again go to the vector vector nodes here and select the mapping so this is the setup we need to create in order to have a little bit more control over our hdr map now when i change this z rotation value to let's say 90 it's gonna take a few seconds but my uh my viewport will update and you can see the background of our hdr map changes so it's rotating within the z-axis and if we have a little bit more strong illumination generated by the hdr map there might be shadows and and light beams visible in the scene since we are using this very diffused light well that's that's unfortunately not the case for our scene but i'm rotating this hdr map in order to see if i'm able to improve the shadows around the stairs here so you can see it actually generates it casts this very interesting shadow in this area so let's see what happens if i change the angle let's say to 270 it actually got darker so maybe let's go to 120 and it became brighter again but the shadows as you can see they are mostly cast upwards it's again different to what we have in our image because the shadows go both up and down so we still need to think how to improve that so we are getting back again to the additional light sources solution and you might be asking like why didn't you go with that from the very beginning and my answer is the simpler you keep the illuminai illuminations set up in your scene the better because it first of all renders faster and second of all is easier to set up so i'm always trying to check if i'm able to achieve a realistic illumination in my scene using just the environment setup only when it's not possible then i'm taking another step further so i'm gonna add a light to improve the shadows in this area the thing is if we plan adding the lights to our scene the additional light sources it's not recommended to mix them with the hdr map because you could argue with that probably but i personally prefer not to mix external light sources with the hdr map so if i want to let's say use a sun lamp a lamp that imitates the sun beams i don't like mixing it with the hdr map and that means we need to change this setup but don't be afraid it doesn't mean we worked for vane the note setup we have in blender gives us a lot of flexibility so i can simply unplug this one node here and now i'm back to my original color only so anytime i want anytime i'm working on the scene and i want to move back and see how the hdr illumination looks like in comparison to the setup i'm let's say creating in the next step i can always do that i can simply plug and unplug the nodes in my scene so and and yet uh you learn how to set up the hdr image so let's now see what we can do with the with the other notes available in blender and one extra note i like using for the environment or for the illumination setup in particular is hidden under the converter and black body here so what the blank body node does in general is setting up the color in regards to the temperature value we can set up here and this value is i hope physically because i never checked it to be honest but i it's really related to the physical temperature values you have let's say on the light bulbs so you can see the default temperature of 1500 is pretty warm so to speak so if we increase it to let's say 4500 it becomes more neutral and if you read a wikipedia article on the color temperature there are actual physical kind of physical uh values we can apply in the blackbody node so uh sticking to around 600 500 6500 sorry case gives us should give us a daylight overcast lining scenario if i type this value here you can see we are more or less back to the simple uh white color we just we could normally set up here but um i think sticking to black body and using the values available well here you can also find them in many other places that gives us a little bit more realistic touch to the scene because if you also set up the light colors for the lamps for example you could obviously use a simple well wheel color wheel like this but i think setting up the temperatures with the actual physical values will always produce better looking and more realistic results so as for the environment light setup i would say that's basically everything we can achieve we have seen that the hdr map didn't bring us the results we wanted if we simply increase this value here it gives us more light in general but it's more of the the same kind of light so again we see there is no shadowing happening here around this area when we compare it the reference you can also see there is probably some additional lights or somewhere behind the photographer casting the slide on the counter here which is not happening in our scene i think that's why i want to thank you for watching this video and invite you to another one where we will add additional light sources to our scene and hopefully nail the view we are looking for so thank you for watching and see you in the next video thank you guys for watching this video is part of my interior visualization course in blender which you can watch for free on youtube all the necessary details and link to the full playlist can be found in the video description if you want to support what i do and access all of the 3d files used in this course plus blender ready interior setups and over 2 000 blender exclusive 3d models just visit the choco for store and learn more about our subscription plans again thanks for watching and i see you soon

Channel: chocofur

Views: 1,769

Keywords: blender, blender 3d, blender guru, cg geek, tutorial, blender tutorial, blender interior, blender interior beginner, blender architecture, blender architecture tutorial, how to make, architecture, visualization, interior visualization, 3d interior visualization, interior visualization blender, interior visualization course, interior visualization secrets in blender, how to, free, archviz, 3d, cgi, blender hdri lighting, blender hdri, blender hdri render, blender interior lighting

Id: pN5BuHitNqc

Length: 17min 1sec (1021 seconds)

Published: Tue Nov 23 2021