3D Texture Mapping in The Foundry Nuke

Question

Here's a Nuke's Python script for creating a camera’s projection matrix and using paint strokes as a texture map. The idea behind it, is to project 3D texture of all objects in the Viewer to screen space through the currently selected camera using paint strokes.

I need to control projected texture's wrapping Width and Height via custom knobs in User tab properties of a Camera node.

How to do it programmatically?

import nuke
import nukescripts

def paintPoints():

geoNode = nuke.activeViewer().node()   

camera = nuke.selectedNode()
if not camera.Class() in ( 'Camera', 'Camera2' ):
    nuke.message( 'Por favor, seleccione un nodo de la cámara primera')
    return

geoKnob = geoNode['geo']
objects = geoKnob.getGeometry()
if not objects:
    nuke.message( 'No se han encontrado geometría en %s' % geoNode.name() )

pts = []
for o in objects:

    objTransform = o.transform()
    for p in o.points():

        worldP = objTransform * nuke.math.Vector4(p.x, p.y, p.z, 1)
        pts.append( [worldP.x, worldP.y, worldP.z] )

curvesKnob = nuke.createNode( 'RotoPaint' )['curves']
task  = nuke.ProgressTask( 'painting points' )

for i, pt in enumerate( pts ):

    if task.isCancelled():
        break

    task.setMessage( 'painting point %s' % i )
    stroke = nuke.rotopaint.Stroke( curvesKnob )
    pos = nukescripts.snap3d.projectPoint( camera, pt )
    ctrlPoint = nuke.rotopaint.AnimControlPoint( pos )
    stroke.append( ctrlPoint )
    curvesKnob.rootLayer.append( stroke )
    task.setProgress( int( float(i)/len(pts)*100 ) )

Answer 1

由于Foundry工程师不赞成使用geo旋钮及其.getGeometry()方法，因此我们应该改用.getGeometryNodes()方法。

如果您需要有关go here的更多详细信息，请写下您的问题。

Answer 2

以下是向节点添加自定义旋钮的方法。 Nuke Developer Guide中的更多细节和图片。

以下示例将控件添加到模糊节点：

IsNull

b = nuke.nodes.Blur() k = nuke.Array_Knob("myctrl", "My Control") b.addKnob(k) 可以替换为.Array_Knob用于滑块，.WH_Knob用于复选框。