USE CORONA SCAT­TER to ADD CARS to A SCENE

3D World - - ARTIST Q&A -

01The PRE­PARE Our VE­HI­CLE mod­els

first step is to pre­pare the car model we will scat­ter. I set the cor­rect maps for the model, then I made the model one sin­gle poly­gon by at­tach­ing all its parts (re­mem­ber to se­lect Match Ma­te­rial to Ma­te­rial IDS). It might take a while at­tach­ing. Once it’s done it might be a good idea to save in a pri­vate at­tached car model col­lec­tion so that you can use it in an­other project with­out hav­ing to at­tach again.

Now it’s time to con­vert the model from V-ray to Corona. I'm us­ing Corona Con­verter v1.39. Se­lect Ma­te­ri­als of se­lected ob­jects, and click Start Con­ver­sion. In the video I show which op­tions I se­lect, but the most im­por­tant I would say is Dis­able Dis­place­ment Maps. Fi­nally check the pivot so that it can be in the cen­tre of the car and at its bot­tom. Now we can pro­ceed.

02 Cre­ate Our traf­fic guides

Now it’s time to add our guides so that our mod­els can be spread where we want them to be. I will use Corona Scat­ter to scat­ter our mod­els along splines. In this case what I did is sim­ple – I started adding lines from one side of the street, then I did more on the other side and fi­nally I added four more in the main street. These are our guides, and all we are go­ing to scat­ter will go right here. In this case I used only straight lines, but you can also add curves and the mod­els will adapt to them too. Al­ways re­mem­ber to have the splines close to the ground.

03 Scat­ter Cars in the Street

Now it’s time to set our Corona Scat­ter, and once it’s in our scene we need to tweak some of the op­tions. In the Scat­ter­ing roll­out se­lect 1D On Splines. This will en­able us to scat­ter our mod­els along the spline. In In­stanced Ob­jects add our car model and in Distribute on Ob­jects we will se­lect our line guides. Now we have the car model scat­tered in the line.

Next in the Trans­for­ma­tions tab, in Ro­ta­tion set z: 90° so we can have the mod­els fac­ing the right way, and now in View­port Dis­play set the % dis­played to 100, so we can see all the mod­els we have in our scene. Fi­nally in Avoid Col­li­sions en­able spac­ing to 100%, this way the mod­els won’t ap­pear over­lapped. Now we have the area filled with cars. Next it’s time for some fi­nal set­tings tweaks for pro­duc­ing our de­sired re­sult.

04 Fi­nal Set­tings

Now we need to make the cars ap­pear life­like. First in Spline Scat­ter­ing we will change the spac­ing. I find that play­ing with the val­ues gives a lot more op­tions, and in this case I ex­per­i­mented with the Spac­ing and the Trans­la­tion val­ues from the Trans­for­ma­tion tab. In this case I set Spac­ing to 6 and Trans­la­tion to 65. I pressed Ren­der and re­ally liked the re­sult. Now we have a nice traf­fic scene us­ing only one model.

Se­lect the car and add it as an ex­cep­tion from the over­ride. Now we have one car, but at the mo­ment ev­ery­thing is the same, so it’s time to make it look like there is more than one model of car. Se­lect the car model and in Slate Ma­te­rial bring their ma­te­ri­als up, find the Carpaint ma­te­rial and then add a Corona Mul­timap. Set it as in­stance and now ev­ery car has a dif­fer­ent colour. You can choose the number of maps to use in Mul­timap. And this is the method I use to add traf­fic to my ren­der. Hope you like it!

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