Three ways to embed an HLSL shader in VRML/X3D

FragmentShader.wrl

#VRML V2.0 utf8

Transform {
	translation -4 2 0
	children Shape {
		appearance Appearance{
			material Material{
				diffuseColor 0 0 0
				emissiveColor 1 1 1
			}
		}
		geometry Text{
			string "FragmentShader (inline)"
			fontStyle FontStyle{
				justify "MIDDLE"
				family "Arial"
				size 0.3
			}
		}
	}
}

Transform {
	translation -4 0 0
	children Shape {
		appearance ShaderAppearance {
			textureTransform TextureTransform {scale 5 5}
			fragmentShader FragmentShader {
				exposedField SFNode png ImageTexture {url "example.png"}
				url "hlsl:
				sampler2D png: register(s0);
				float4 main( float2 tex0: TEXCOORD0 ): COLOR {
					return tex2D(png, tex0);
				}
				"
			}
		}
		geometry Box{}
	}
}

PackagedShader.wrl

#VRML V2.0 utf8

Transform {
	translation 4 2 0
	children Shape {
		appearance Appearance {
			material Material {
				diffuseColor 0 0 0
				emissiveColor 1 1 1
			}
		}
		geometry Text{
			string "PackagedShader (.fx)"
			fontStyle FontStyle{
				justify "MIDDLE"
				family "Arial"
				size 0.3
			}
		}
	}
}

Transform {
	translation 4 0 0
	children Shape {
		appearance Appearance {
			textureTransform TextureTransform {scale 5 5}
			shaders PackagedShader {
				language "HLSL"
				exposedField SFNode png ImageTexture {url "example.png"}
				url "example.fx"
			}
		}
		geometry Box{}
	}
}

VertexShader.wrl

#VRML V2.0 utf8

Transform {
	translation 0 2 0
	children Shape {
		appearance Appearance {
			material Material {
				diffuseColor 0 0 0
				emissiveColor 1 1 1
			}
		}
		geometry Text{
			string "VertexShader (.fx)"
			fontStyle FontStyle{
				justify "MIDDLE"
				family "Arial"
				size 0.3
			}
		}
	}
}

Transform {
	translation 0 0 0
	children Shape {
		appearance ShaderAppearance {
			textureTransform TextureTransform {scale 5 5}
			vertexShader VertexShader {
				exposedField SFNode png ImageTexture {url "example.png"}
				url "example.fx"
			}

		}
		geometry Box{}
	}
}