Create shadows

Scripting Issues
1

Hello all…
I was doing a trial small game and liked to put shadow for each model in the game…but after I saw the tutorial called shadow, I get shocked because it is so hard to do using Cg or GLSL, and I didn’t understand anything from these scripts

-Is there an easy way to make shadows without the use of Cg or GLSL language?

-could I find a good site that explain this language in details?

Thanks in advance

2

As of Panda3D 1.7.0, you can use shadows via the Shader Generator, so you won’t have to write shaders yourself.

3

I read about doing shadows in 1.7.0 version, but no shadow appears when I tried it
here is the code:

import direct.directbase.DirectStart
from pandac.PandaModules import DirectionalLight,VBase4
from panda3d.core import Shader

cube=loader.loadModel("cube.egg")
cube.reparentTo(render)
cube.setPos(0,8,-0.8)

sphere=loader.loadModel("sphere.egg")
sphere.reparentTo(render)
sphere.setPos(0,8,0)

plight=DirectionalLight('plight')
plight.setColor(VBase4(0.5,0.5,0.5,1))
plnp=render.attachNewNode(plight)
plnp.setHpr(0,270,0)
render.setLight(plnp)

base.camLens.setFov(30)
plight.setShadowCaster(True, 512, 512)
sphere.setShaderAuto()
run()

and it also gives me this message:

:display:gsg:glgsg(error): c:\panda3d-1.7.0\panda\src\glstuff\glGraphicsBuffer_src.cxx, line 989: GL error 1282

I don’t know what is the problem

4

DirectionalLights are a bit tricky to setup for shadowing. You have to adjust the frustum of the lens (film size, near/far, etc) in order to get it to cast shadows properly.

5

use plight.showFrustum() to see the fustrum so you can set it up right.

plight.getLens().setFilmSize(1000,1000)
plight.getLens().setFar(1000)

is how ive set it up, a cube of length 1000 in every axis.

i also had another bug (which ive yet to investigate) but if you still cant see shadows after that, try creating a spotlight, for whatever reason that made my directional light magically start casting shadows (my spotlight was coded exactly as the one in the manual).