Jump to content
Sign in to follow this  
knj

Your advice . . .

Recommended Posts

waza.jpg

I've just started my internship and my first model is that vase you see above. Can you give me some of yours advice in terms of workflow. I'm not worried (for now) about the modeling part, but about texturing all that. What you think would be the best approach. Find some old greek painting smillar to that one and make some alphas in zbrush (HP), or only use crazy bump or smth similar to generate normals (but will it look any good ?) it needs to be nicely detailed.

i will probably go with alphas in zbrush, but i would love to see what are your workflows for object like this

// edit

but what i think (just got it in my head) that only the darker areas are more spec than the others, so i think i dont need to scuplt all that "paint" ?

Share this post


Link to post
Share on other sites

model the vase, make a nice unwrap and then paint it in photoshop. these paintings are pretty easy to fake, as long as you stay consistent with your brushes. where's your internship btw? i'm sure your employer should/would be able to help you?

Share this post


Link to post
Share on other sites

Model your high poly mesh in your 3d package and bake an AO and Normal map from that onto your lowpoly mesh. There's no need to bring it into a sculpting program and using crazybump to generate your normals isn't going to be of much use as the painting is flat (has no surface detail.)

Just find a flat painting like the one on the vase and texture it onto your diffuse in photoshop. The only normal information you want is from the vase itself, not the painting. Though I suppose you could do a crazybump pass from your finished diffuse to get small surface detail, then overlay it on top of your baked normals with the blue channel ticked off. But really, especially if you're going for that clean, restored look as per the reference, the baked normal from the sub-d mesh will be more than enough.

Also look into cube maps, could come in handy on a piece like this ;)

Share this post


Link to post
Share on other sites

I'm not sure where to find them, as I can't seem to locate any that have that classic greek or roman style theme, but I know there are images floating around online of 360 degree photography of actual historical vases. basically they set up a camera and a automated turntable, slowly rotate the vase while snapping photos, then take a slice of each photo and combine them, visually unwrapping the vase evenly.

if you could find one of those, it would be a cool thing to utilize or take reference from. or, like Bunglo suggested, finding a roman painting thats similar and start with that. (that might be alot easier.)

Share this post


Link to post
Share on other sites

Thank you a lot guys, i haven't have lots of time lately, i just did LP model i start working in zbrush to get this destroyed look (yes, it turned out is must be damaged). After some work is done, i will post it here for you to take a look

Share this post


Link to post
Share on other sites

Ok so yestarday i've started doing smth, but i'm sooooo frustrated, so i've modeled the vase

lp.png

then i've add some edge of control to make a smooth mesh (it is trangulated)

hp_1.png

then i've layouted uv's on lp

checker.png

(i'm aware of some streachings)

uv.png

using xnormal i've baked normal map

normal_uv.jpg

after using that normal map in maya, my model looks like shit

normal.png

is this becouse of bad uv layout ?

or i've fu**ed with my smooth mesh ?

Share this post


Link to post
Share on other sites

I can't tell which one is your high poly model and which one is the low.

I'm not familiar with Maya nor Xnormal, so I'll give you some general tips for a piece like this. First, try and make the high poly mesh do as much work as it can. If you can get away with having a single face look as though there's a beveled dip in it (such as with the lip of the vase), just use a single face in the low poly. It looks like you've modeled out the lip in it's entirety which isn't necessary, a proper bake of the highpoly will yield the same results with less tris.

Smoothing the lowpoly correctly before you bake is super important. You don't want any unnecessary gradients or artifacts as those will show up in the normal map when you bake. Where there is a "hard edge" in your smoothing (this is assuming correct smoothing setup), break that UV island on that hard edge and separate the two by a few pixels. This will remove any weird black seems that you would get if you kept the island as one piece. Packing your UVs too tight is a bad thing. You need to account for mipping when you're unwrapping a mesh so that when you zoom out from the model, UV islands don't start bleeding into one another. The resolution you're baking at will determine (for the most part) how far away you want each island to be from one another. The idea is that you want the padding from the bake to fill up the gutters (empty space between UV islands). So if you bake at 2048 with a padding of 8 pixels, have your islands 16 pixels apart is a good amount to ensure the padding from each island meets in the middle of the gutter.

Take a look at these links for more info:

http://www.polycount.com/forum/showthread.php?t=80947

http://wiki.polycount.com/NormalMap?highlight=%28\bCategoryTexturing\b%29#Baking

If you make that large cut of the vase thicker (as in, pull the inner faces toward the center of the mesh), it'll be easier to bake and will read better in game. Also, that weird, extruded chunk on the right of the vase makes no sense.

Share this post


Link to post
Share on other sites

Thank you soo much for feedback, i didn't start to model HP model, i've just added some extra edges to create a smooth mesh and check out how my normal map will look, and after seeing this i just tried (3-4) different uv layouts.

Also, that weird, extruded chunk on the right of the vase makes no sense.

hmm i was aiming for broken handle look.

Share this post


Link to post
Share on other sites

Also, that weird, extruded chunk on the right of the vase makes no sense.

hmm i was aiming for broken handle look.

Ahhh, it does make sense :P Adding more of the handle back into the mesh might be better for easier identification. It'll probably add more interest to the silhouette as well.

Share this post


Link to post
Share on other sites

OMG Bunglo, thank you sooo much for those links above, there are so many things i didnt even know that are so important, hmm i will do some "tests and practice" and maybe tomorrow i will start my vase, probably from zero

//edit

this is mostly what i did wrong,

http://www.polycount.com/forum/showthread.php?t=66651

is there some script to do it, or just by "hand" ? or maybe some other solution ?

Share this post


Link to post
Share on other sites

More tips:

Watch your triangles distribution. Does it really pays off to have the mesh so dense in top left corner? And why is there a edge loop cutting through it? That only doubles the tri-count.

Your UV's are also wrong and too packed. Also, try and avoid wavy lines, everything that looks like this: ) straight it up to make it look like this: |. Otherwise you'll get artifacts when you bake, plus straight UV's will make your life easier when you get to the texturing phase.

Learning as you go is good but don't jump the gun on this one, watch at least a couple of tutorials on baking, I recommend at least this one:

http://cg.tutsplus.com/tutorials/autode ... n-3ds-max/ (Yes it's max, but who the fuck cares, it works the same in maya)

Share this post


Link to post
Share on other sites

Thank you HP for the tips, so i started my tests, and what i did

1. model the vase base from scratch

2. flip every other triangle to get the nice shading

waza_0.jpg

3. uv that model (only cylindrical mapping)

uv.jpg

i know it is not great, but i left it as rectangels just for tests,

3. in zbrush, added some random alphas

4. xnormal baked the normal map

normal.jpg

5. in maya it looks like this

waza_1.jpg

much better, BUT

6.i have some artefacts

waza_2.jpg

normals_1.jpg

some help ? :)

Share this post


Link to post
Share on other sites

first of all: great improvement.

second task: can you post a picture that shows where the artifacts happen on the model and in the uv map and post a picture with a checker board rendered on the vase, to see what if there's any stretching going on?

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...