Getting Started Rendering in Vray (EP 5) - BUMP MAPS vs DISPLACEMENT MAPS in Vray for SketchUp

what's up guys Justin here from de rendering essentials comm back with another vray for sketchup tutorial for you so in this video I wanted to talk about some of the differences between bump mapping and displacement mapping for creating rough surfaces in v-ray so let's go ahead and just jump into it and so what we're gonna do is I'm gonna start off and I'm just gonna apply a simple material to a face within Sketchup so I'm just gonna draw a rectangle here and what I'm gonna do is I'm gonna go into my named colors and I'm gonna pick one of these kind of white colors so in this case we'll go ahead and go with this snow color and so the reason I'm gonna do this is I want to demonstrate the way that bump Maps work within v-ray so what a bump map is is basically a bump map is when v-ray uses a texture image to determine where it should simulate bumpiness within your model so it's basically a shading effect that gets applied to your model and so what I want to do in this case is originally if we were to just come in here and we were to just do an interactive render of this face it's just gonna be kind of a flat face so if I was to zoom in a little bit you can see how this is just a white face there's nothing really remarkable about it or anything like that well what I'm gonna do is I'm gonna apply a bump map to this material and so what that's gonna do is that's gonna basically give this material it's gonna tell v-ray to determine some shading things about this material and so we're gonna go in we're gonna select our material you're gonna go into your map section and we're gonna turn on bump or normal mapping and so when we do that nothing's changed yet because all this is it's just a white color basically so there's no actual texture applied to it so if we were to do another interactive render things haven't really changed well what we're gonna do is we're gonna go in and we're gonna apply a map to this material so in this case I'm just gonna click on this little button right here and what that's gonna do is that's going to give me a whole bunch of different things that I can apply to this texture well in this case what we want to do is we want to go up to the option for bitmap and so in this case this is actually gonna work pretty good this defaulted to some of your library stuff for V so depending on your computer this may look a little bit different but right now I'm in the v-ray for Sketchup extension materials folder and then within the material I've got a stone and then a Maps and what we want to look for is we want to look for a bump map material or a bump map and so what a bump map is is it doesn't necessarily have to be black and white but it's basically an image that shows v-ray where some things should be kind of extended out from a flat face and where other materials shouldn't be so like if I look at this stone be bump for example if I go in I click and open this basically what this is is this is a texture image but it's been basically black and white mapped so basically what this means is when we load this in v-ray for your is going to know that the black material or the white materials are gonna stick out and reflect more than the black materials and so this is basically a map showing v-ray what to do with the materials and so what we're gonna do is we're gonna double click on that and when we double click on that then we can go ahead and we can go back and you're gonna notice that if you look at your material preview now you can see how basically v-ray is simulating light bouncing off of these mortar joints even though we don't have an image applied to that and so basically what that means is we've applied a bump map to this material so if I was to go in now and run the interactive render and we're gonna zoom in a little bit you'll notice that basically what we're a is doing is v-ray is simulating light bumping off of this bump map and so basically we've taken this white material and we've told v-ray to simulate light bouncing using that bump map now it works in kind of the same way with an actual textured material so I'm actually gonna close out of these what we're gonna do is we're just gonna push pull this up a little bit and we're gonna select this whole thing by triple clicking on it and then within the asset editor let's apply a material to that so in this case I'm going to apply this stone G a hundred centimeter so I'm going to add that to my scene then we're gonna right click on it I'm going to click apply material to selection and so you'll notice since this is a v-ray material this actually comes preset to do bump or normal mapping and so what that means is this already has that image pre applied to it because it's a v-ray material most most of these materials have that pre applied and so let's see if we can tell the difference on something like this it's very slight but you can tell the difference so if we go in here and we do an interactive render let's go ahead and turn our bump mapping off and so if you look at this when you turn your bump mapping off basically this material is kind of flat so you're not really getting any kind of light bouncing off the joints or anything like that and I'm gonna link to a video about rounding your corners off as well to make this look more realistic we're not going to talk about that in this video but that's also affecting the realism here but if I go in and I turn on the bump mapping you'll notice that you're just getting a little bit more light reflection specifically on this edge over here based off of the amount of bump that's applied in here and if you want to make this if you want to make this effect more pronounced you can adjust this slider for a mount so you can drag this up and you'll notice that your bump becomes more pronounced in here but you do have to be a little bit careful if you start really bumping this up you can see how this kind of over does everything and it doesn't look more realistic anymore and so but you can see how you can use this bump mapping in here to kind of simulate those rough faces the nice thing about bump mapping is it isn't very processor intensive meaning you can apply bump mapping without this really slowing down your model however you're just kind of limited in the amount of actual geometry motion and effect simulation that you can have using bump maps and so that's where we're gonna come in and we're going to talk about displacement mapping and so I'm gonna stop my interactive render and I'm gonna close all this off and now we're gonna talk about our second kind of mapping which is displacement mapping so bump mapping basically takes this map and it simulates the light bouncing off of that without actually changing your geometry well the other thing we can do is we can also apply a displacement map and so what a displacement map is going to do and I'm gonna reverse this face and one thing to notice about this is this works a lot better with group geometry so in this case I'm gonna select this I'm gonna right-click on it I'm gonna click make group and applying the material to group geometry works a lot better within Sketchup when you're doing displacement maps but basically what a displacement map is gonna do is it's actually going to simulate moving the actual geometry so this simulates the light bouncing but this will actually kind of move the vertexes or vertices of your material on here and so as an example let's go ahead and let's take this other white material which is this 0 11 seashell and we're gonna apply that to this face and so right now we have this seashell material and you can see how just like before this is just basically a white material so there's nothing really remarkable about it well we're gonna do the same kind of thing that we did with bump mapping but we're gonna do it with displacement and so in order to do that you're gonna go ahead and click this drop down in order to get into your displacement settings and the first thing we're gonna do is enable displacement and just like bump mapping this didn't really affect anything because there's nothing in here telling it where and what to displace so like there's no map or anything like that so if we were to do an interactive render you can see how this isn't really changing other than it takes a little bit longer to render so what we want to do is we want to do the same thing as before but we want to click on this little box right here and we want to apply one of those Maps to this material so we're just gonna go into bitmap again and in this case what this did which is kind of nice is it actually took me straight to this folder and so what I'm gonna do in this case is I'm going to I'm gonna apply this stone F bump map to this material so you can herb this stone F map to this material and you can see when I do that this brings this in and now if I click back what you're gonna notice about this especially if you look at your preview is that this is doing something similar to what the color 10 did so if I click on the color 10 you can see how this is basically using the light to simulate the way materials gonna look well this 0:11 is actually moving the geometry around and so let's go ahead and let's run a render now with this displacement map active so if I go ahead and click on the interactive render button the first thing you're going to notice is this is going to take a little bit longer to load and this will kind of vary depending on your computer but what I'm gonna do is I'm gonna rotate down on this material to kind of show you what this is doing so if you remember before that other material stays completely flat well in this case what this is doing is this is actually moving the geometry within your model so you can see how if I kind of move down to the edge right here what this is doing is this is actually moving the vertices based on that map so this is actually changing the geometry to kind of simulate that face and let's try let's go in here and let's find a different material map to apply to this and so you can see how one thing about that is it wasn't it was pronounced but it wasn't quite as pronounced I think as we want it to be so what we're gonna do is we're gonna go in here and click on the little folder let's actually apply this stone bead bump map that's probably a lot better example because it's a lot rougher so if i zoom in and I look at this you can see how this is actually basically mapping the material and it's changing the geometry in here but when you kind of zoom out and you look at this you can see how it's moving it a little bit too much and this has a tendency to kind of turn into a little bit of nonsense geometry and so what we're gonna do is we're gonna reduce the amount of movement that we have within this displacement map so I'm gonna go back to my displacement section and I'm going to bring this down to something like 0.25 in my amount and so when I bring this down to 0.25 and then zoom in on it you can see how this is actually moving the geometry in here to actually simulate actual roughness and one thing you'll notice is this takes a lot longer to do it's a lot more processor intensive but you can definitely use that to simulate more realistic settings in here and so I'm going to go ahead and I'm going to delete this example out and we'll stop our interactive render and what I'm going to do now is I'm actually going to apply a brick material to a face and then we can kind of take a look and see what that does so in this case what I'm going to do is I'm gonna go into my bricks material and we'll go ahead and we'll use let's use this bricks weathered and apply that and then we'll go ahead and apply material to selection and so the first thing I need to do is I need to double-click on this geometry and group it and then apply this material to the selection so that this works properly but you can see how right now if I run an interactive render this does this just has bump mapping turned on so if I run an interactive render this is simulating the bumps with the bump map well what I want to do is I want to go in and instead of using the bump map and one trick for this is you can come in here and you can copy the file location from your bump map and then go back in you can turn on displacement and turn off bump mapping you can click on this folder and you can just paste this into your file location you can see how that's applying that map to this material so now if we back out and we reload our interactive render you can see how this is applying that displacement map to this face and in this case what we're gonna do is we're going to bring our displacement amount down again so I'm gonna bring that down to 0.25 but you can see how if you kind of zoom down or rotate down you can see how this is giving you the actual bump geometry within your rendering so and then one last thing to note about this is there's a couple different settings in here down below that can adjust basically how much geometry is being created so in this case your edge length to defaults to 4 well the lower the setting is in your edge length the more memory this is gonna take up well if I come in here and I change my edge length to something like 12 then what this is gonna do is this isn't gonna simulate quite as many edges in here and it's not gonna take as long to render but the trade-off there is that means that this is also not going to be as detailed as it what a benefits was set to for so generally speaking you don't really need to change your subdivision all that much so focus on your edge length if you're trying to make things work a little bit faster but generally speaking you're not gonna use displacement mapping a whole lot unless you're trying to really show some detail within your rendering so because it slows everything down so much this just takes a lot longer in order to calculate all of this geometry and the vertices moving around this will just take a lot longer to actually render so you're not actually gonna use the displacement mapping all that much unless you're creating a really detailed rendering where you're getting in close kind of like this so and then you still need to play around with your settings like your amount kind of thing to get the actual look that you're going for so that's kind of a quick overview of the difference between bump mapping and displacement mapping leave a comment below let me know what you thought did you like this tutorial was it helpful to you was there something I left out I just loved having that conversation with you guys if you like this video please remember to click that like button down below if you're new around here remember to click that subscribe button for new rendering content every week as always thank you so much for taking the time to watch this I really appreciate it and I will catch you in the next video thanks guys

Channel: The Rendering Essentials

Views: 42,332

Keywords: rendering tutorials, SketchUp rendering, Vray Rendering, the rendering essentials, therenderingessentials, rendering lessons, photorealistic rendering tutorials, architectural visualization, sketchup vray, sketchup vray tutorials, vray bump map, vray displacement map, vray displacement materials, vray bump map materials, vray materials, vray displacement rendering, vray bump rendering

Id: yBRMqt5-DHU

Length: 15min 1sec (901 seconds)

Published: Tue May 15 2018