use instances ?

[Hamed.Mojtabavi]

hi
is there any one here that can use instances ? and how??????

[mib2berlin]

Hi, you need a release candidate version of octane, latest is 3.03.
Tutorial:

http://www.youtube.com/watch?feature=pl ... PsGuKA3dZY

Some exporter supports instances, blender do for example.

Cheers, mib.

[Hamed.Mojtabavi]

Hi, you need a release candidate version of octane, latest is 3.03.
Tutorial:

http://www.youtube.com/watch?feature=pl ... PsGuKA3dZY

Some exporter supports instances, blender do for example.

Cheers, mib.

tanx alot mib2berlin

Do you know how to use it in max ? is that like regular instaces in max?

[face_off]

For Octane Standalone, load the mesh you want to instance into an objects->mesh node. Then plug that node into a objects->scatter node. Plug the scatter node into the mesh pin of the rendertarget node. You will need to add at least one transform to the scatter node.

The transform is a position, scale and rotation matrix (only the first 3 rows of the 4x4 matrix). You can either make a transform matrix by hand, or generate one (not via Octane Standalone). I'm not a 3DS Max person, but I understand you can use the scatter plugin to generate the transform matrix. The OctaneRender for Poser plugin will generate the transform for you too.

[vanhage]

Hello,

I've spent a few hours looking into creating an automatic scatter node matrix exporter to generate all the transforms parametrically using Rhino5/grasshopper and save them out as a txt file to automate things like foliage and entourage in Octane. I have some questions/observations that hopefully someone can shed some light on.

-I tend to work in mm, but it appears that all the camera controls and matrix inputs for the scatter node are in Meters? I would have thought that when you set the obj import units, those units would be the units for the file, guess not.

-Is there a way to swap the Y and Z axes for the coordinate system so that Z is up? I work mostly in rhino and grasshopper and all my transformation matrices are generated XYZ, NOT XZY.

-Correct me if i'm wrong, but it seems like the Z axis is working backwards. When I input values in the scatter node I have to input a negative value for Z to get it to move in the positive direction. I know this is the case in computer graphic software like processing, but I've never seen it in a 3d program. Am I missing something?

Thanks,
~Vanhage

[face_off]

-I tend to work in mm, but it appears that all the camera controls and matrix inputs for the scatter node are in Meters? I would have thought that when you set the obj import units, those units would be the units for the file, guess not.

Octane works in metres, so the transformation matrix needs to be in metres.

-Is there a way to swap the Y and Z axes for the coordinate system so that Z is up? I work mostly in rhino and grasshopper and all my transformation matrices are generated XYZ, NOT XZY.

If you are NOT using the daylight environment, you can re-assign the "up" vector of the camera to compensate for this (set up to 0, 0, 1). However ideally you should transform your transformation matrix such that Octane X = Rhino X, Octane Y = Rhino Z and Octane Z = Rhino Y (or maybe -Y). Whilst that is simple for vectors, it may be tricky for the rotation matrix part of the transform. I convert EVERYTHING to the Octane axis system before applying quaternions/rotation matrices. So if you have a plane that your transforms will be placed on, convert the Rhino coord system to Octane XYZ prior to applying any rotations you need. Good luck!

Paul

[newske]

I use scatter from Rhino frequently.

A short python function for this would be:

def XFormFlipYZ(matrix):
XBasis= rs.XformChangeBasis2((1,0,0),(0,1,0),(0,0,1),(1,0,0),(0,0,1),(0,-1,0))
return(XBasis * matrix)

This will map Rhino Z to OBJ Y