- "gl_Position = MVP * vec4(vtx_position, 1);\n"
- "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
+ "gl_Position = MVP * vec4(vtx_position, 1.0);\n"
+ "vtx_viewspace = (MV * vec4(vtx_position, 1.0)).xyz;\n"
+ "nrm_viewspace = (MV * vec4(vtx_position, 0.0)).xyz;\n"