一个显示物体截面的效果shader

晃晃

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电梯直达

楼主

发表于 2011-9-2 08:21:46 |只看该作者 |倒序浏览

这个shader做讲解时可以用的到，可以方便的将物体以截面形式显示。

看下效果：

这个
下面是代码：
// 2 Pass Edition
Shader "cross_section_v004a"
{
Properties
{
section_depth ("section depth (x, y, z, depth)", vector) = (0,0,0,0.15)
section_color ("section color", color) = (0.5,0.1, 0.1, 1)

color_map ("color map", 2D) = "white" {}

}
SubShader
{
Pass
{
CULL OFF

CGPROGRAM //--------------
//#pragma target 3.0
#pragma vertex vertex_shader
#pragma fragment fragment_shader

#include "UnityCG.cginc"

uniform float4 section_depth;
uniform float4 section_color;
uniform sampler2D color_map;

float4x4 rotate(float3 r)
{
float3 c, s;
sincos(r.x, s.x, c.x);
sincos(r.y, s.y, c.y);
sincos(r.z, s.z, c.z);
return float4x4( c.y*c.z, -s.z,    s.y, 0,
s.z, c.x*c.z, -s.x, 0,
-s.y,    s.x, c.x*c.y, 0,
  0,    0,    0, 1 );
}

s***ct a2v
{
float4 vertex : POSITION;
float4 color : COLOR;
float2 texcoord : TEXCOORD;
float3 normal : NORMAL;
};

s***ct v2f
{
float4 position : POSITION;
float2 texcoord : TEXCOORD0;
float4 normal : TEXCOORD1;
float4 vertex : TEXCOORD2;
float4 mask : TEXCOORD3;
};

v2f vertex_shader( a2v IN )
{
v2f OUT;

float4x4 r = rotate(radians(section_depth.xyz) +_SinTime.xyz);
float4 c = float4(IN.vertex.xyz,1);

OUT.mask = mul(r, c);
OUT.position = mul(glstate.matrix.mvp, IN.vertex);
OUT.texcoord = IN.texcoord;

r *= float4x4( 1,-1,-1, 0,
-1, 1,-1, 0,
-1,-1, 1, 0,
0, 0, 0, 1 ); // the section_depth.xyz need to be inverted !

OUT.normal = mul(r, float4(1,0,0,1));
OUT.vertex = IN.vertex;

return OUT;
}

void fragment_shader( v2f IN,
out float4 finalcolor : COLOR)

{
if(IN.mask.x > section_depth.w)
discard;

float3 N = IN.normal.xyz;

N = mul(glstate.matrix.invtrans.modelview[0], float4(N, 1));
float diffuse = saturate(dot(glstate.light[0].position, N));

finalcolor = float4(0,0,0,1);
finalcolor.xyz = section_color *(diffuse *0.6 +0.4);
}
ENDCG //--------------

} // Pass

//---------------------------------------------------------------------------------

Pass
{
CULL BACK

CGPROGRAM //--------------
#pragma vertex vertex_shader
#pragma fragment fragment_shader

#include "UnityCG.cginc"

uniform float4 section_depth;
uniform float4 section_color;
uniform sampler2D color_map;

float4x4 rotate(float3 r)
{
float3 c, s;
sincos(r.x, s.x, c.x);
sincos(r.y, s.y, c.y);
sincos(r.z, s.z, c.z);
return float4x4( c.y*c.z, -s.z,    s.y, 0,
s.z, c.x*c.z, -s.x, 0,
-s.y,    s.x, c.x*c.y, 0,
  0,    0,    0, 1 );
}

s***ct a2v
{
float4 vertex : POSITION;
float4 color : COLOR;
float2 texcoord : TEXCOORD;
float3 normal : NORMAL;
};

s***ct v2f
{
float4 position : POSITION;
float2 texcoord : TEXCOORD0;
float3 normal : TEXCOORD1;
float4 vertex : TEXCOORD2;
float4 mask : TEXCOORD3;
};

v2f vertex_shader( a2v IN )
{
v2f OUT;

float4x4 r = rotate(radians(section_depth.xyz) +_SinTime.xyz);
float4 c = float4(IN.vertex.xyz,1);

OUT.mask = mul(r, c);
OUT.position = mul(glstate.matrix.mvp, IN.vertex);
OUT.texcoord = IN.texcoord;
OUT.normal = IN.normal;
OUT.vertex = IN.vertex;

return OUT;
}

void fragment_shader( v2f IN,
out float4 finalcolor : COLOR)

{
if(IN.mask.x > section_depth.w)
discard;

float3 N = IN.normal;

N = mul(glstate.matrix.invtrans.modelview[0], float4(N, 1));
float diffuse = saturate(dot(glstate.light[0].position, N));

finalcolor = float4(0,0,0,1);
finalcolor.xyz = tex2D(color_map, IN.texcoord).xyz *(diffuse *0.6 +0.4);
}
ENDCG //--------------

} // Pass

} // SubShader
} // Shader