Nodes and Nodegraphs in Lua.

[colorcurvature]

hi, is it possible to change a node type from diffuse to glossy?
i tried using updateProperties() but my changes seem to get ignored

[stratified]

No, once a node is created, you can't alter it's type anymore.

We can add replacement to the API. As a work around, you can create a glossy node, delete the diffuse node and reconnect the glossy node with everything the diffuse node was connected to.

cheers,
Thomas

[Slide3D]

Please help to write a script for automatic connecting mix material(macro) with objects material nodes
example of what i need in the picture

[stratified]

Hi there,

I don't know the exact connection logic you're after but I can give you an example of how you connect a material to a mesh. The next snippet connects a material to all the pins of the mesh. You would need to write your own code to figure out exactly which connections to make:

Code: Select all

-- connect the material to all the pins of the mesh
for pinIx=1,mesh:getPinCount() do
    mesh:connectToIx(pinIx, material)
end

Here's a full test script, just select a material and a mesh and run the script. Afterwards, all the connections should be made:

Code: Select all

--
-- Select a material and a mesh
--

local mesh, material = nil, nil

-- figure out the selection of the material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("a material and a mesh needs to be selected") end
if selection[1]:getProperties().type == octane.NT_GEO_MESH and
   selection[2]:getProperties().type == octane.NT_MAT_DIFFUSE then
    mesh, material = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_MAT_DIFFUSE and
       selection[2]:getProperties().type == octane.NT_GEO_MESH then
    mesh, material = selection[2], selection[1]
else
    error("a material and a mesh need to be selected")
end

-- connect the material to all the pins of the mesh
for pinIx=1,mesh:getPinCount() do
    mesh:connectToIx(pinIx, material)
end

before running the script

before.png (10.44 KiB) Viewed 5801 times

after running the script, all connections are made

I hope this steers you in the right direction.

cheers,
Thomas

[roeland]

There is a script doing something similar with imported alembic scenes (Alembic and material assignments), maybe it can be adapted for mesh nodes too.

--
Roeland

[Slide3D]

Thanks Stratified
whether it is possible to select multiple materials?

[Slide3D]

I got several codes for each material
it is possible to unite in one code?

Code: Select all

--
-- Select a limbs material and a mesh
--

local mesh, limbs = nil, nil

-- figure out the selection of the limbs material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("a material and a mesh needs to be selected") end
if selection[1]:getProperties().type == octane.NT_GEO_MESH and
   selection[2]:getProperties().type == octane.NT_MAT_MIX then
    mesh, limbs = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_MAT_MIX and
       selection[2]:getProperties().type == octane.NT_GEO_MESH then
    mesh, limbs = selection[2], selection[1]
else
    error("a material and a mesh need to be selected")
end

-- connect the material to all the pins of the mesh
pinIx=1,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=17,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=18,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=23,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=24,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)

Code: Select all

--
-- Select a toso material and a mesh
--

local mesh, torso = nil, nil

-- figure out the selection of the torso material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("a material and a mesh needs to be selected") end
if selection[1]:getProperties().type == octane.NT_GEO_MESH and
   selection[2]:getProperties().type == octane.NT_MAT_MIX then
    mesh, torso = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_MAT_MIX and
       selection[2]:getProperties().type == octane.NT_GEO_MESH then
    mesh, torso = selection[2], selection[1]
else
    error("a material and a mesh need to be selected")
end

-- connect the material to all the pins of the mesh
pinIx=16,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=19,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=20,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=21,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=22,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=28,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)

and for other mats

[bepeg4d]

hi thomas,
i have tried to convert your script for connecting an object layer node to all the pins of an object layer map node, but it works only for some pins and leaves always the others unconnected:

Code: Select all

--
-- Select an object layer map and an object layer node
--

local Object_Layer_Map, Object_Layer = nil, nil

-- figure out the selection of the material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("an object layer map and an object layer node needs to be selected") end
if selection[1]:getProperties().type == octane.NT_OBJECTLAYER_MAP and
   selection[2]:getProperties().type == octane.NT_OBJECTLAYER then
    Object_Layer_Map, Object_Layer = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_OBJECTLAYER and
       selection[2]:getProperties().type == octane.NT_OBJECTLAYER_MAP then
    Object_Layer_Map, Object_Layer = selection[2], selection[1]
else
    error("an object layer map and an object layer node need to be selected")
end

-- connect the object layer to all the pins of the object layer map
for pinIx=17,Object_Layer_Map:getPinCount() do
    Object_Layer_Map:connectToIx(pinIx, Object_Layer)
end

another question, the best would be to use an "object layer in" node but i'm not able to sobstitute the "Object_Layer" with the input version, where is the mistake?

Code: Select all

--
-- Select an object layer map and an object layer in node
--

local Object_Layer_Map, Object_Layer_In = nil, nil

-- figure out the selection of the material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("an object layer map and an object layer in node needs to be selected") end
if selection[1]:getProperties().type == octane.NT_OBJECTLAYER_MAP and
   selection[2]:getProperties().type == octane.IN_OBJECTLAYER then
    Object_Layer_Map, Object_Layer_In = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.IN_OBJECTLAYER and
       selection[2]:getProperties().type == octane.NT_OBJECTLAYER_MAP then
    Object_Layer_Map, Object_Layer_In = selection[2], selection[1]
else
    error("an object layer map and an object layer in node need to be selected")
end

-- connect the object layer in node to all the pins of the object layer map
for pinIx=17,Object_Layer_Map:getPinCount() do
    Object_Layer_Map:connectToIx(pinIx, Object_Layer_In)
end

ciao beppe

[stratified]

I got several codes for each material
it is possible to unite in one code?

Code: Select all

--
-- Select a limbs material and a mesh
--

local mesh, limbs = nil, nil

-- figure out the selection of the limbs material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("a material and a mesh needs to be selected") end
if selection[1]:getProperties().type == octane.NT_GEO_MESH and
   selection[2]:getProperties().type == octane.NT_MAT_MIX then
    mesh, limbs = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_MAT_MIX and
       selection[2]:getProperties().type == octane.NT_GEO_MESH then
    mesh, limbs = selection[2], selection[1]
else
    error("a material and a mesh need to be selected")
end

-- connect the material to all the pins of the mesh
pinIx=1,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=17,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=18,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=23,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)
pinIx=24,mesh:getPinCount()
mesh:connectToIx(pinIx, limbs)

Code: Select all

--
-- Select a toso material and a mesh
--

local mesh, torso = nil, nil

-- figure out the selection of the torso material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("a material and a mesh needs to be selected") end
if selection[1]:getProperties().type == octane.NT_GEO_MESH and
   selection[2]:getProperties().type == octane.NT_MAT_MIX then
    mesh, torso = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_MAT_MIX and
       selection[2]:getProperties().type == octane.NT_GEO_MESH then
    mesh, torso = selection[2], selection[1]
else
    error("a material and a mesh need to be selected")
end

-- connect the material to all the pins of the mesh
pinIx=16,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=19,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=20,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=21,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=22,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)
pinIx=28,mesh:getPinCount()
mesh:connectToIx(pinIx, torso)

and for other mats

Yes, it's possible but now you would have 3 things in your selection and 6 different cases to consider...

I'm not sure what you're trying to accomplish with your script? You just want to make the connectios or is there a general rule to which connections to make? You could store a table mapping a material to all the pins on the mesh it connects to and loop over this to make the desired connections.

Code: Select all

-- maps a matterial to all the pins
connections = { ["V6Torso"] = { "dzmat_Head", "dzmat_Neck", "dzmat_Hips", "dzmat_Torso" } }

for i,pinName in ipairs(connections["V6Torso"]) do
    print(string.format("connect material %s to pin %s", "V6Torso", pinName))
    -- do the connections here...
end

cheers,
Thomas

[stratified]

hi thomas,
i have tried to convert your script for connecting an object layer node to all the pins of an object layer map node, but it works only for some pins and leaves always the others unconnected:

Schermata 2014-01-17 alle 10.59.03.jpg

Code: Select all

--
-- Select an object layer map and an object layer node
--

local Object_Layer_Map, Object_Layer = nil, nil

-- figure out the selection of the material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("an object layer map and an object layer node needs to be selected") end
if selection[1]:getProperties().type == octane.NT_OBJECTLAYER_MAP and
   selection[2]:getProperties().type == octane.NT_OBJECTLAYER then
    Object_Layer_Map, Object_Layer = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_OBJECTLAYER and
       selection[2]:getProperties().type == octane.NT_OBJECTLAYER_MAP then
    Object_Layer_Map, Object_Layer = selection[2], selection[1]
else
    error("an object layer map and an object layer node need to be selected")
end

-- connect the object layer to all the pins of the object layer map
for pinIx=17,Object_Layer_Map:getPinCount() do
    Object_Layer_Map:connectToIx(pinIx, Object_Layer)
end

another question, the best would be to use an "object layer in" node but i'm not able to sobstitute the "Object_Layer" with the input version, where is the mistake?

Code: Select all

--
-- Select an object layer map and an object layer in node
--

local Object_Layer_Map, Object_Layer_In = nil, nil

-- figure out the selection of the material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("an object layer map and an object layer in node needs to be selected") end
if selection[1]:getProperties().type == octane.NT_OBJECTLAYER_MAP and
   selection[2]:getProperties().type == octane.IN_OBJECTLAYER then
    Object_Layer_Map, Object_Layer_In = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.IN_OBJECTLAYER and
       selection[2]:getProperties().type == octane.NT_OBJECTLAYER_MAP then
    Object_Layer_Map, Object_Layer_In = selection[2], selection[1]
else
    error("an object layer map and an object layer in node need to be selected")
end

-- connect the object layer in node to all the pins of the object layer map
for pinIx=17,Object_Layer_Map:getPinCount() do
    Object_Layer_Map:connectToIx(pinIx, Object_Layer_In)
end

ciao beppe

Hi Beppe,

You only start making connections from pin 17 in your code (If you look at your picture, the first 16 pins aren't connected). You should make connections starting from pin 2 (The first pin takes a mesh so we should skip it):

Code: Select all

-- connect the object layer to all the pins of the object layer map
for pinIx=2,Object_Layer_Map:getPinCount() do
    Object_Layer_Map:connectToIx(pinIx, Object_Layer)
end

The type for an input linker taking as input an object layer is octane.NT_IN_OBJECTLAYER not IN_OBJECT_LAYER.

This code should do the trick:

Code: Select all

--
-- Select an object layer map and an object layer in node
--

local Object_Layer_Map, Object_Layer_In = nil, nil

-- figure out the selection of the material and the mesh
local selection = octane.project.getSelection()
if #selection ~= 2 then error("an object layer map and an object layer in node needs to be selected") end
if selection[1]:getProperties().type == octane.NT_OBJECTLAYER_MAP and
   selection[2]:getProperties().type == octane.NT_IN_OBJECTLAYER then
    Object_Layer_Map, Object_Layer_In = selection[1], selection[2]
elseif selection[1]:getProperties().type == octane.NT_IN_OBJECTLAYER and
       selection[2]:getProperties().type == octane.NT_OBJECTLAYER_MAP then
    Object_Layer_Map, Object_Layer_In = selection[2], selection[1]
else
    error("an object layer map and an object layer in node need to be selected")
end

-- connect the object layer in node to all the pins of the object layer map
for pinIx=2,Object_Layer_Map:getPinCount() do
    Object_Layer_Map:connectToIx(pinIx, Object_Layer_In)
end

cheers,
Thomas