Honestly? I don’t know. I see everyone talking about PSSM shadows these days, but I’m not sure.
Here are some examples of smooth shadows I found:
[Soft Shadows)
[Paraboloid Shadow Map + PCF Smooth)
Demomaster has one too, but you need to edit the program a bit to not crash on 1.8.
The shader is located in “demomaster-0.8/share/shaders/softshadow.sha”.
//Cg
void vshader(float4 vtx_position : POSITION,
float2 vtx_texcoord0: TEXCOORD0,
float3 vtx_normal: NORMAL,
uniform float4x4 trans_model_to_clip_of_light,
uniform float4x4 mat_modelproj,
uniform float4 mspos_light,
out float4 l_position : POSITION,
out float2 l_texcoord0 : TEXCOORD0,
out float4 l_shadowcoord : TEXCOORD1,
out float l_smooth : TEXCOORD2,
out float4 l_lightclip : TEXCOORD3
)
{
l_position = mul(mat_modelproj, vtx_position);
l_texcoord0 = vtx_texcoord0;
l_smooth = saturate(dot(vtx_normal, normalize(mspos_light - vtx_position)));
//float4 pushed = vtx_position + float4(vtx_normal, 0);
float4 pushed = vtx_position + float4(vtx_normal*0.2, 0);
l_lightclip = mul(trans_model_to_clip_of_light, pushed);
l_shadowcoord = l_lightclip * float4(0.5,0.5,0.5,1.0) + l_lightclip.w * float4(0.5,0.5,0.5,0.0);
}
void fshader(in float2 l_texcoord0 : TEXCOORD0,
in float4 l_shadowcoord : TEXCOORD1,
in float l_smooth : TEXCOORD2,
in float4 l_lightclip : TEXCOORD3,
uniform float4 attr_color: COLOR,
uniform sampler2D tex_0 : TEXUNIT0,
uniform sampler2D k_depthmap : TEXUNIT1,
uniform float4 k_props,
uniform float4 k_texDisable,
out float4 o_color:COLOR)
{
float3 circleoffs = float3(l_lightclip.xy / l_lightclip.w, 0);
float falloff = saturate(1.0 - dot(circleoffs, circleoffs));
//float4 baseColor = saturate(tex2D(tex_0, l_texcoord0) + k_texDisable.x);
float4 baseColor;
float4 proj = l_shadowcoord / l_shadowcoord.w;
float shade = 1 - saturate((proj.z - tex2D(k_depthmap, proj.xy)) * k_props.y);
//o_color = baseColor * (shade * falloff * l_smooth + k_props.x);
if (k_texDisable.x > 0)
o_color = attr_color * (shade * falloff * l_smooth + k_props.x);
else {
baseColor = tex2D(tex_0, l_texcoord0);
o_color = baseColor * (shade * falloff * l_smooth + k_props.x);
}
}
(demomaster also seems to have a PSSM shader).
Anything else I found was for PSSM:
[PSSM Shadows)
panda3d.org/forums/viewtopic … c&start=30 (3rd post from bottom)
Some articles:
http.developer.nvidia.com/GPUGem … _ch10.html
cg.tuwien.ac.at/research/vr/lispsm/
That’s all I know.
