Shadows are grainy

When I do shadows they look grainy.

from math import pi, sin, cos
 
from direct.showbase.ShowBase import ShowBase
from direct.task import Task
from direct.actor.Actor import Actor
from direct.interval.IntervalGlobal import Sequence
from panda3d.core import *
 
class MyApp(ShowBase):
    def __init__(self):
        ShowBase.__init__(self)
 
        # Disable the camera trackball controls.
        self.disableMouse()
 
        # Load the environment model.
        self.environ = self.loader.loadModel("models/environment")
        # Reparent the model to render.
        self.environ.reparentTo(self.render)
        # Apply scale and position transforms on the model.
        self.environ.setScale(0.25, 0.25, 0.25)
        self.environ.setPos(-8, 42, 0)
 
        # Add the spinCameraTask procedure to the task manager.
        self.taskMgr.add(self.spinCameraTask, "SpinCameraTask")
 
        # Load and transform the panda actor.
        self.pandaActor = Actor("models/panda-model",
                                {"walk": "models/panda-walk4"})
        self.pandaActor.setScale(0.005, 0.005, 0.005)
        self.pandaActor.reparentTo(self.render)
        # Loop its animation.
        self.pandaActor.loop("walk")
 
        # Create the four lerp intervals needed for the panda to
        # walk back and forth.
        pandaPosInterval1 = self.pandaActor.posInterval(13,
                                                        Point3(0, -10, 0),
                                                        startPos=Point3(0, 10, 0))
        pandaPosInterval2 = self.pandaActor.posInterval(13,
                                                        Point3(0, 10, 0),
                                                        startPos=Point3(0, -10, 0))
        pandaHprInterval1 = self.pandaActor.hprInterval(3,
                                                        Point3(180, 0, 0),
                                                        startHpr=Point3(0, 0, 0))
        pandaHprInterval2 = self.pandaActor.hprInterval(3,
                                                        Point3(0, 0, 0),
                                                        startHpr=Point3(180, 0, 0))
 
        # Create and play the sequence that coordinates the intervals.
        self.pandaPace = Sequence(pandaPosInterval1,
                                  pandaHprInterval1,
                                  pandaPosInterval2,
                                  pandaHprInterval2,
                                  name="pandaPace")
        self.pandaPace.loop()
        self.light = render.attachNewNode(Spotlight("Spot"))
        self.light.node().setScene(render)
        self.light.node().setShadowCaster(True)
        self.light.node().showFrustum()
        self.light.node().getLens().setFov(4000)
        self.light.node().getLens().setNearFar(10, 100)
        self.light.setP(-80)
        render.setLight(self.light)
        self.light.setPos(0,0,90)

        self.alight = render.attachNewNode(AmbientLight("Ambient"))
        self.alight.node().setColor(LVector4(0.5, 0.5, 0.5, 1))
        render.setLight(self.alight)

        # Important! Enable the shader generator.
        render.setShaderAuto()
 
    # Define a procedure to move the camera.
    def spinCameraTask(self, task):
        angleDegrees = task.time * 6.0
        angleRadians = angleDegrees * (pi / 180.0)
        self.camera.setPos(20 * sin(angleRadians), -20.0 * cos(angleRadians), 3)
        self.camera.setHpr(angleDegrees, 0, 0)
        return Task.cont
 
app = MyApp()
app.run()

Looks like it is a low resolution shadow map. Review this manual page on how to increase the resolution of the shadow map: panda3d.org/manual/index.php … ow_Mapping

Don’t set the field of view to 4000. Set it to a lower value, like 30 - 60.