9 posts / 0 new
Last post
ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

first i must aplogize coz of my english it is not my native language and second i am totaly new in this. i have no knowledge in 3 d modeling but i am learning like a lot of other things i learned by myself. i made a cup, coffee cup following the video tutorial, i manage to figure out how to painted into desired color, and now i want to add a coffee in it. how i can do that i am lost. i tried adding a cube and shrink it and then color it into black, but, that did not work, can i paint the inside of a cup into black? if yes how? pls help me... i totally like this...

ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

Hi Anchi,
Does this match what you wanted ? :
http://www.les-ziboux.rasama.org/exported/mug-with-k3d.png
If so, you may get the corresponding K3D file here :
http://www.les-ziboux.rasama.org/download/mug-with-k3d.tar.gz
Tell me if that match, I will tell you more about the involved steps.

ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

This one is even cooler :
http://www.les-ziboux.rasama.org/exported/mug-with-k3d-2.png
Far from being perfect (the shiny part of coffee is not smoothed and there is still this anomaly with the mug's handle), but show well enough what K-3D + RenderMan is able to.

ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

Third version.
http://www.les-ziboux.rasama.org/exported/mug-with-k3d-3.png
Used an hyperboloid for coffee capillarity (now smoothed), and saw the singularity with the mug handle, is due to something wrong with BridgeFaces (I worked around using extrusion instead). Still can see something wrong with perspective (surprisingly, the perspective is fine in the 3D View).

ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

Hey, that looks nice, project loads fine here! I think the perspective has to do with the camera transformation, you can manipulate it by using zoom (ctrl-right-click while moving the mouse up/down) and then dolly using the mouse wheel. That allows you to get the same framing with different perspective.

ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

Note : I updated the archive pointed to by the link in the second post (it initially only contained the K3D file corresponding to the first version of the mug… the soft-green one, now it includes the three).
I could not figure out the perspective matter. I looked for a lens parameter (I suspected something like that) but did not found one.

ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

We don't have an actual system of lenses in K-3D, instead, a system similar to the OpenGL transformation is used. See http://www.songho.ca/opengl/gl_projectionmatrix.html
These values are related to the camera options, where the left, right, top, bottom, near and far parameters can be defined in the Camera node. Renderman supports the same settings through the ScreenWindow and Clipping directives (you can see the generated rib files in /tmp).
A more intuitive way is using the camera zooming, but I was wrong in my previous mail: you should ctrl-middle drag for zoom and then dolly in to reframe. Ctrl-right drag is another way to dolly (i.e. move the camera closer or further). Attached is a version of the mug with changed perspective.
An animation of the change is also on wikipedia: http://en.wikipedia.org/wiki/Perspective_distortion_(photography)

ForumImport
Offline
Last seen: 8 years 10 months ago
Joined: 09/22/2009 - 18:47
Need help making cup

We don't have an actual system of lenses in K-3D, instead, a system similar to the OpenGL transformation is used. See http://www.songho.ca/opengl/gl_projectionmatrix.html
These values are related to the camera options, where the left, right, top, bottom, near and far parameters can be defined in the Camera node. Renderman supports the same settings through the ScreenWindow and Clipping directives (you can see the generated rib files in /tmp).
A more intuitive way is using the camera zooming, but I was wrong in my previous mail: you should ctrl-middle drag for zoom and then dolly in to reframe. Ctrl-right drag is another way to dolly (i.e. move the camera closer or further). Attached is a version of the mug with changed perspective.
An animation of the change is also on wikipedia: http://en.wikipedia.org/wiki/Perspective_distortion_(photography)

sparrkli
Offline
Last seen: 5 years 6 months ago
Joined: 01/13/2013 - 20:21
Could you help a bit with the

Could you help a bit with the cup you have made? Cause i have seen few tutorials but i have done some things that i do not know how to do, so i would appreciate very much if you could helpo out 

Log in or register to post comments