Hello,
I’m trying to undeerstand how does Spotlight work and specillay trying to enlarge the area being lighted. I tried to adjust the field of view, near / far and filmSize but still not able to get the result I’m aming.
One solution is to put the Spotlight very far from the scene but the effect I would have to obtain is a Spotlight ligthing a room from near but a large area!
Here’s my test:
import direct.directbase.DirectStart
from pandac.PandaModules import *
from direct.gui.OnscreenText import OnscreenText
from direct.showbase.DirectObject import DirectObject
import sys
class Start(DirectObject):
def __init__(self):
self.accept("escape", sys.exit)
self.accept('p',self.addFov)
self.accept('o',self.remFov)
self.accept('k',self.addFSize)
self.accept('l',self.remFSize)
instruction1= OnscreenText(text='o:add FOV p: rem FOV',scale=.07,pos=(-1,.9))
instruction2= OnscreenText(text='k:add FSize l: rem FSize',scale=.07,pos=(-1,.8))
self.fov= OnscreenText(text='FOV',scale=.07,pos=(-1,.4))
self.fSize=OnscreenText(text='Film Size',scale=.07,pos=(-1,.1))
self.bSmiley= loader.loadModel('smiley.egg')
self.bSmiley.reparentTo(render)
self.bSmiley.setScale(3)
self.light = Spotlight('light')
self.light.setColor(Vec4(2, 2, 2, 1))
self.plnp = render.attachNewNode(self.light)
self.plnp.setPos(0,-4.5,0)
self.plnp.lookAt(self.bSmiley)
render.setLight(self.plnp)
self.sSmiley= loader.loadModel('smiley.egg')
self.sSmiley.reparentTo(self.plnp)
self.sSmiley.setScale(.05)
base.disableMouse()
base.camera.setPos(3,-8,10)
base.camera.lookAt(self.sSmiley)
def addFov(self):
tmpFov= self.light.getLens().getFov()
self.light.getLens().setFov(tmpFov +10)
self.fov['text']= str(self.light.getLens().getFov())
def remFov(self):
tmpFov= self.light.getLens().getFov()
self.light.getLens().setFov(tmpFov -10)
self.fov['text']= str(self.light.getLens().getFov())
def addFSize(self):
tmpFSize= self.light.getLens().getFilmSize()
self.light.getLens().setFilmSize(tmpFSize+ (10,10))
self.fSize['text']= str(self.light.getLens().getFilmSize())
def remFSize(self):
tmpFSize= self.light.getLens().getFilmSize()
self.light.getLens().setFilmSize(tmpFSize- (10,10))
self.fSize['text']= str(self.light.getLens().getFilmSize())
Start()
run()If you try this code :pressing ‘p’ is supposed to enlarge the FOV. I do understand that a lamp is somehow a camera and that FOV need to be between 0 and 180 but I do not understand why the bigger smiley is not lighted anymore when the value 50 is bypassed.
Is the max FVO value of a lamp smaller than max FOV of a camera ?
Originally, I tried this on a room… So that’s not linked to the fact that smiley is a sphere.
