add trenchbroom map

assets/shader/Viewmodel.gdshader

@@ -0,0 +1,55 @@
+shader_type spatial;
+render_mode blend_mix,depth_draw_opaque,cull_back,diffuse_burley,specular_schlick_ggx;
+
+uniform float viewmodel_fov = 50.0f;
+
+uniform vec4 albedo = vec4(1.0);
+uniform sampler2D texture_albedo;
+uniform float specular = 0.5f;
+uniform float metallic = 1.0f;
+uniform float roughness : hint_range(0,1) = 1.0f;
+uniform float point_size : hint_range(0,128);
+uniform sampler2D texture_metallic;
+uniform vec4 metallic_texture_channel = vec4(1.0, 0.0, 0.0, 0.0);
+uniform sampler2D texture_roughness;
+uniform vec4 roughness_texture_channel = vec4(1.0, 0.0, 0.0, 0.0);
+//uniform sampler2D texture_emission : hint_black_albedo;
+//uniform vec4 emission : hint_color;
+//uniform float emission_energy;
+uniform sampler2D texture_normal : hint_normal;
+uniform float normal_scale : hint_range(-16,16) = 0.5f;
+uniform vec3 uv1_scale = vec3(1.0f);
+uniform vec3 uv1_offset = vec3(0.0f);
+uniform vec3 uv2_scale = vec3(1.0f);
+uniform vec3 uv2_offset = vec3(0.0f);
+
+void vertex() {
+	UV = UV * uv1_scale.xy + uv1_offset.xy;
+	
+	/* begin shader magic*/
+	float onetanfov = 1.0f / tan(0.5f * (viewmodel_fov * PI / 180.0f));
+	float aspect = VIEWPORT_SIZE.x / VIEWPORT_SIZE.y;
+	// modify projection matrix
+	PROJECTION_MATRIX[1][1] = onetanfov;
+	PROJECTION_MATRIX[0][0] = onetanfov / aspect;
+	// draws the viewmodel over everything (disable if you want dof near on viewmodel)
+	POSITION = PROJECTION_MATRIX * MODELVIEW_MATRIX * vec4(VERTEX.xyz, 1.0);
+	POSITION.z = mix(POSITION.z, 0, 0.999);
+	/* end shader magic */
+}
+
+void fragment() {
+	vec2 base_uv = UV;
+	vec4 albedo_tex = texture(texture_albedo,base_uv);
+	albedo_tex *= COLOR;
+	ALBEDO = albedo.rgb * albedo_tex.rgb;
+	float metallic_tex = dot(texture(texture_metallic,base_uv),metallic_texture_channel);
+	METALLIC = metallic_tex * metallic;
+	float roughness_tex = dot(texture(texture_roughness,base_uv),roughness_texture_channel);
+	ROUGHNESS = roughness_tex * roughness;
+	SPECULAR = specular;
+	NORMAL_MAP = texture(texture_normal,base_uv).rgb;
+	NORMAL_MAP_DEPTH = normal_scale;
+	//vec3 emission_tex = texture(texture_emission,base_uv).rgb;
+	//EMISSION = (emission.rgb+emission_tex)*emission_energy;
+}