Modified ligth shader

gistfile1.java

rayHandler = new RayHandler(world);
rayHandler.setAmbientLight(0f, 0f, 0f, 0.5f);
rayHandler.setBlurNum(0); 
rayHandler.setLightShader(createStepLightShader());


private ShaderProgram createStepLightShader () {
		final String vertexShader =
			"attribute vec4 vertex_positions;\n" //
			+ "attribute vec4 quad_colors;\n" //
			+ "attribute float s;\n"
			+ "uniform mat4 u_projTrans;\n" //
			+ "varying vec4 v_color;\n" //
			+ "varying float v_s;\n" //
			+ "void main()\n" //
			+ "{\n" //
			+ "   v_color = quad_colors;\n"
			+ "   v_s = s;"
			+ "   gl_Position =  u_projTrans * vertex_positions;\n" //
			+ "}\n";

		final String fragmentShader = "#ifdef GL_ES\n" //
			+ "precision lowp float;\n" //
			+ "#define MED mediump\n"
			+ "#else\n"
			+ "#define MED \n"
			+ "#endif\n" //
			+ "varying vec4 v_color;\n" //
			+ "varying float v_s;\n" //
			+ "void main()\n"//
			+ "{\n" //
			+ "  float a = 0.75 + step(0.25, v_s) * .25;\n"
			+ "  gl_FragColor = vec4(v_color.rgb, a);\n" //
			+ "}";

		ShaderProgram.pedantic = false;
		ShaderProgram lightShader = new ShaderProgram(vertexShader,
			fragmentShader);
		if (!lightShader.isCompiled()) {
			Gdx.app.log("ERROR", lightShader.getLog());
		}

		return lightShader;
	}