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jMonkeyEngine is a 3-D game engine for adventurous Java developers

There is a newer version: 3.7.0-stable

#import "Common/ShaderLib/GLSLCompat.glsllib"
uniform mat4 g_ViewMatrix;
uniform mat4 g_ProjectionMatrix;
uniform mat4 g_WorldMatrixInverse;

uniform vec3 m_NormalScale;

attribute vec3 inPosition;
attribute vec3 inNormal;

varying vec3 direction;

void main(){
    // set w coordinate to 0
    vec4 pos = vec4(inPosition, 0.0);

    // compute rotation only for view matrix
    pos = g_ViewMatrix * pos;

    // now find projection
    pos.w = 1.0;
    gl_Position = g_ProjectionMatrix * pos;

    vec4 normal = vec4(inNormal * m_NormalScale, 0.0);
    direction = (g_WorldMatrixInverse * normal).xyz;
}