source: GTP/trunk/App/Demos/Illum/Shark3D/version164x12u/IllumDemo/src/res/levelutil/shader/prog/ogl_glsl/shvol_og.s3d @ 2196

///////////////////////////////////////////////////////////////////////////////
//
//      ##  ######
//       ######  ###
//  ## ###############        Shark 3D Engine (www.shark3d.com)
//   ########## # # #
//    ########                Copyright (c) 1996-2006 Spinor GmbH.
//   ######### # # #          All rights reserved.
//  ##   ##########
//      ##
//
///////////////////////////////////////////////////////////////////////////////

@include "levelutil/shader/prog/ogl_glsl/" \
        "stddef_ogl_glsl_vs1x0.s3d_shadercode_run"

///////////////////////////////////////////////////////////////////////////////

uniform vec4 lightCenRange;
uniform vec4 lightExtrude;

S3D_BONE_DECL_STD(boneWgh, boneSubscr)
S3D_MATBONE_DECL_STD(matBone)

///////////////////////////////////////////////////////////////////////////////

void main(void)
{
    S3D_BONE_TRANSF_STD(matBoneFinal, matBone, boneWgh, boneSubscr);
    vec4 posView = matBoneFinal * gl_Vertex;
    vec3 normalView = normalize((matBoneFinal * vec4(gl_Normal, 0.0)).xyz);

    // Calculate normalized extrusion direction vector:
    vec3 dirNrm = normalize(posView.xyz - lightCenRange.xyz);

    // Extrude:
    float prod = dot(dirNrm, normalView) * lightExtrude.z;
    // Important! If the product is zero, extrusion must be off.
    float sign = (prod > 0.0) ? 1.0 : 0.0;
    float move = sign * lightExtrude.x + lightExtrude.y;
    posView.xyz = move * dirNrm + posView.xyz;

    // Transform:
    gl_Position = gl_ProjectionMatrix * posView;
}

///////////////////////////////////////////////////////////////////////////////