+ f32 accum = 0.0f;
+
+ u8 colour[] = { 80,80,80,255 };
+ v3f light_dir = {0.3f,0.8f,0.1f};
+ v3_normalize( light_dir );
+
+ v3f inv_ext;
+ v3_sub( pcbuf->boundary[1], pcbuf->boundary[0], inv_ext );
+ v3_div( (v3f){1.0f,1.0f,1.0f}, inv_ext, inv_ext );
+
+ for( u32 i=0; i<world->scene_geo.indice_count/3; i++ ){
+ u32 *tri = &world->scene_geo.arrindices[i*3];
+ struct world_surface *surf = world_tri_index_surface( world, tri[0] );
+
+ if( surf->info.shader == k_shader_boundary ||
+ surf->info.shader == k_shader_invisible ) continue;
+
+ if( !(surf->info.flags & k_material_flag_preview_visibile) ) continue;
+
+ scene_vert *va = &world->scene_geo.arrvertices[tri[0]],
+ *vb = &world->scene_geo.arrvertices[tri[1]],
+ *vc = &world->scene_geo.arrvertices[tri[2]];
+
+ v3f v0, v1, vn;
+ v3_sub( vb->co, va->co, v0 );
+ v3_sub( vc->co, va->co, v1 );
+ v3_cross( v0, v1, vn );
+ if( vn[1] < 0.0f ) continue;
+
+ f32 density = 1.0f;
+ if( surf->info.surface_prop < vg_list_size(densities) )
+ density = densities[surf->info.surface_prop];
+
+ f32 area = v3_length(vn)*0.5f*density;
+ accum += area;
+
+ v3_normalize( vn );
+
+ while( accum > rate ){
+ accum -= rate;
+
+ if( pcbuf->count >= pcbuf->max ) return total_area;
+
+ v2f co = { vg_randf64(), vg_randf64() };
+ if( v2_length2(co) > 0.5f ){
+ co[0] = 1.0f-co[0];
+ co[1] = 1.0f-co[1];
+ }
+
+ v3f pt;
+ v3_muls( v0, co[0], pt );
+ v3_muladds( pt, v1, co[1], pt );
+ v3_add( va->co, pt, pt );
+
+ if( pt[1] < world->water.height ) continue;
+ pointcloud_vert *vert = &pcbuf->buf[ pcbuf->count ++ ];
+
+ v3f pos;
+ v3_sub( pt, pcbuf->boundary[0], pos );
+ v3_mul( pos, inv_ext, pos );
+
+ for( u32 i=0; i<3; i++ ){
+ vert->pos[i] = (pos[i]-0.5f) * 32767.0f;
+ }
+
+ static v4f colours[] = {
+ [k_surface_prop_concrete] = { 0.13, 0.15, 0.17, 1.0 },
+ [k_surface_prop_grass] = { 0.07, 0.1, 0.14, 1.0 },
+ [k_surface_prop_metal] = { 0.15, 0.19, 0.22, 1.0 },
+ [k_surface_prop_wood] = { 0.1, 0.13, 0.17, 1.0 },
+ [k_surface_prop_tiles] = { 0.05, 0.06, 0.07, 1.0 },
+ };
+
+ v4f col = {0.0f,0.0f,0.0f,0.0f};
+ if( surf->info.surface_prop < vg_list_size(colours) ){
+ v4_copy( colours[surf->info.surface_prop], col );
+ }
+
+ f32 brightness = v3_dot(vn,light_dir)*0.5f+0.5f;
+ v3_muls( col, brightness, col );
+
+ for( u32 j=0; j<4; j++ ){
+ vert->colour[j] = col[j] * 255.0f;
+ }