rendering depth buffer

Scripting Issues
1

Hey guys,

I’m having some trouble attempting to render the depth buffer of a scene. It appears as though it is still just rendering the color buffer, and I can’t figure out why that is. I’m using the latest windows release of Panda3d.

Any ideas? Thanks!

Python:

...
manager = FilterManager(base.win,base.cam)
tex = Texture()
dtex = Texture()
quad = manager.renderSceneInto(colortex=tex,depthtex=dtex)
quad.setShader(Shader.load("depthviz.sha"))
quad.setShaderInput("dtex",dtex)
...

Shader:


void vshader(
  float4 vtx_position : POSITION,
  float2 vtx_texcoord0: TEXCOORD0,
  uniform float4 texpad_dtex,
  out float4 l_position : POSITION,
  out float2 l_texcoord0: TEXCOORD0,
  uniform float4x4 mat_modelproj)
{
  l_position=mul(mat_modelproj, vtx_position);
  l_texcoord0 = vtx_position.xz * texpad_dtex.xy + texpad_dtex.xy; 
}

void fshader(
  float2 l_texcoord0: TEXCOORD0,
  uniform sampler2D tex_dtex,
  out float4 o_color : COLOR)
{
  float4 res = tex2D(tex_dtex,l_texcoord0);
  o_color = res;
}
2

You have to set the filters, as in the shadow sample :

dtex.setMinfilter(Texture.FTShadow)
dtex.setMagfilter(Texture.FTShadow)
3

Thanks for the quick response. However, doing what you suggested doesn’t seem to help. I have included all the code, is there anything else that I am missing?

import direct.directbase.DirectStart
from direct.filter.FilterManager import FilterManager
from pandac.PandaModules import *

manager = FilterManager(base.win,base.cam)
tex = Texture()
dtex = Texture()
dtex.setMinfilter(Texture.FTShadow)
dtex.setMagfilter(Texture.FTShadow)

quad = manager.renderSceneInto(colortex=tex,depthtex=dtex)
quad.setShader(Shader.load("depthviz.sha"))
quad.setShaderInput("dtex",dtex)

# camera setup
base.cam.setPos(0,5,2)
base.cam.lookAt(Point3(0,0,0),Vec3(0,0,1))

monkey = loader.loadModel('monkey')
monkey.reparentTo(render)

base.disableMouse()
run()
4

Eh, sorry, I didn’t think. It has nothing to do with shadow.
It’s the format :
dtex.setFormat(Texture.FDepthComponent)

5

Okay, again I tried that, but still no luck. Browsing through the source and docs, the texture format should be automatically assigned through the

addRenderTexture

call done through the

FilterManager::renderSceneInto

function. Is anyone able to set up a quick simple program that renders the depth buffer to the screen, using the FilterManager?

6

Ok I found the issue and resolved it.

In the fragment shader I had this parameter

 uniform sampler2D tex_dtex

which should have been

  uniform sampler2D tex_1

. Then in the program I manually added the depth texture to the quad.

My problem was that I assumed that

 quad.setShaderInput("dtex",dtex)

passed the texture to the shader, which I don’t think it was. panda3d.org/manual/index.php/Gener … ge_Filters says something along these lines, so it may be an issue with the filter shader generator or still my understanding.