Hello. When I press F12 I got message "No render output node?
I look all over the node table but there is non. Add-Node-Output-?
Do you know where it is.
Thanks.
Check Image nodes, to the left from Material nodes, there is checkmark on Render tab Post Processing Compositor and no nodes in Image node tree which is also checked probably.
Actually, my preference would be to put these icons like Material, Texture and only then Image as opposed to sequence we have now.
eppo, thanks for helping. I try to add image texture (Wood) on my table with glossy surface but this dont work for me. Then I try to add normal material look like metal and laborate with plenty of different settings but I am afraid I mess up everything.
Take a look at my blend file and give me some advices.
Thanks.
http://www.pasteall.org/blend/23583
Modeling: That was one square with hole in it, then what, arrays? You need to check Merge for arrays. That tabletop had thousands of double vertices and it was full of internal faces which is very bad thing. All due to 2 unticked checkboxes.
It was one node in Image nodes and no Output, like i said. That happens for me too, because if i want to make a material and open node editor, by default it’s set to Image nodes where i quickly check “use nodes” and only then realize that’s not where i want to be and switch over to Material nodes. If it happens like in your file where Image Output is deleted… No render.
Metal for a big flat surface with very sharp edges is tricky beast. Due to model, it’s had to bevel edges, which would give a bit more pleasing result. Also, lights need to be balanced. Lots of tweaks. In general, some sort of scratch, bump texture, Anistropy instead of plain Glossy and mix by Fresnel value more than 5 could give a metallic look.
Procedural textures with nodes don’t work with Cycles. Don’t know why Eppo brings that up.
However, on the left of it, there is the button to access the node tree of the Compositor. Go there.
You can leave the RGB input node but you must disable “Use nodes”. You ask Blender to use the Compositor but there is no output node in your Compositor tree… And no input either. That’s what Blender complains about.
Another way is to disable the compositing in the Post-Processing panel of the Render tab.
EDIT: Eppo beat me on the finish line… by 1 minute only. Doh! 
Thank you guys. Interesting. Many things to be confused about. I need to spend more time on node settings.
eppo: Every time there is doubles the object look strange and I press Remove doubles. OK Bevel edges instead of Sharp edges.
( Some sort of scratch bump texture ) Mix - Anistropy- Fresenel. OK. I prefer wood surface.
Kaluura: To disable “Use Nodes” OK ? I try without.
Thanks once more.
@Kaluura
“Procedural textures with nodes don’t work with Cycles”
confused. totally.
Node tree created in Node Editor Textures window? Texture, which uses nodes? Was that what you mean?
“You ask Blender to use the Compositor but there is no output node in your Compositor tree”
that’s the one. told yall…
“To disable “Use Nodes”” - for Image nodes, not for Material nodes; see three icons on Node Editor menu: 1. Image, 2. Texture, 3. Material and checkboxes to the right. You have to uncheck at Image (or, on Render tab, Postprocessing checkbox Compositing, which is another way to say “Don’t mess with rendered image, just give it to me”).
There is Wood material node tree example applied to the tabletop in blend.
eppo, thank for important help. I come back to you.
@Eppo: I was suggesting the same thing than you: To disable “Use Nodes” in the Compositor. I was just confused by the fact that you called it “Image” instead of “Compositor”. I’ve never heard anybody referring to it this way.
I thought that you were talking about the procedural textures which can be created in the Node Editor when you click the Texture button in between Compositor and Material. These are really borked when Cycles is activated. 
Yeah, darn terminology… Still Image nodes, Texture nodes and Material nodes… Sure i was saying to uncheck Image thingie, so i could not figure where did i go procedural :D. Btw, Image part is called Compositor just on the Render tab and there is Compositing layout to choose from Screen Layouts dropdown. All the rest leads to Node Editor…go figure.
Edit: Sure your’e right, icon is called “Compositor”, guess, my bad.
Hello again.
I started a new project, that I learn more from by doing same things repeatedly.
This time I made a floor with wood texture and chrome table with glass top and enviroment image.
1.
I still have problems with the reflective surface on the floor, despite experimenting with all six million nodes.
2.
I try using Shift + Up Arrow to rotate my Enviroment texture but it does not rotate? It has been my previous attempts made.
From one of the tutorial I learned from (see screenshot), I try to retrieve Vector Mapping Node where I usually rotate HDR textures, but I can not find the node, though I’ve been looking for hours??
3rd
I was not happy with the noise after rendering with samples 200-400. I put up the samples to 1.000.
This is the best render so fare. Let me know what missing.
I think myself that my iMac Mid 2011 10.8.4 64 bit is the problem because I have only CPU and need to run Experimenatal When I render with Cycle. http://www.pasteall.org/blend/23648
Thanks.
I do not think you’ll get much of reflections on floor; HDRI usually do not leave much anyways. What you could do is to immitate some sun rays getting through the trees - add Sun lamp and make some shade to shine it through. That could be costly to the render times though.
Reflection for floor probably could be the same well known mix of Diffuse and Glossy, driven by Layer Weight Facing or Fresnel.
Mapping node relates to Vector group of nodes; if you hit T in node editor you get Toolbar on the left with all nodes listed.
Can’t remember using Shift - Up to rotate Environment, but Mapping node Z Rotation does that for sure.
You’re using Bump for a Glass in a strange manner… Normally that’s different.
What i would recommend is select vertical face ring for the table top and assign second material - darker green Glass.
1000 passes is about it; it’s much faster if you have nvidia viodeo card and use CUDA for Cycles on that, but i can’t really see the reason why you would need to use Experimental feature set - there is nothing in this scene requiring that even on the CPU.
To lesser noise there are some tricks you could learn looking into the Cycles wiki or Bartek Skorupa’s (hope i spell name right) tutorials on Blender Cookie.
Thanks eppo. I have learned a lot about the nodes through you and Kaluura and I want to keep practicing.
This time I dont have any problem to move/rotate the background enviroment texture with the node.
Can I do so that the whole picture looks clear all the way, like a photo. Now the background (HDR) look blurred.
Hello, eppo and thanks for valuable tips, I appreciate them very much.
Well, I’ve noticed that there are different sizes of HDR to download. One that goes around 360. I can try to make my own HDR. Purchased HDR are too expensive.
I’ve made a new project to practice on. I like this method because I learn better.
This time I vill test to make the floor with single planks and Unwrap texture with Mark Seam and follow your advice abouth node settings and try “Floor Plank Script”
