fixed terrain tiles generation

[demo] / src / meshgen.cc

diff --git a/src/meshgen.cc b/src/meshgen.cc
index 9547cee..c6a4f48 100644 (file)
--- a/src/meshgen.cc
+++ b/src/meshgen.cc
@@ -119,7 +119,7 @@ void gen_geosphere(Mesh *mesh, float rad, int subdiv, bool hemi)
        for(int i=0; i<num_verts; i++) {
                mesh->indices[i] = i;
        }
-       mesh->update_vertex_data();
+       mesh->invalidate();
 }
 
 // ------ heightfield ------
@@ -129,7 +129,7 @@ static Vec3 hfield_vertex(float u, float v, float h, float xsz,
 {
        float x = u * xsz - xsz / 2.0;
        float y = h * height;
-       float z = -(v * ysz - ysz / 2.0);
+       float z = v * ysz - ysz / 2.0;
 
        return Vec3(x, y, z);
 }
@@ -165,9 +165,9 @@ void gen_heightfield(Mesh *mesh, float xsz, float ysz, float height, int usub,
        float dv = 1.0 / (float)num_vvertices;
 
        for(int i=0; i<num_vvertices; i++) {
-               float v = (float)i / (float)num_vvertices;
+               float v = 1 - (float)i / (float)(num_vvertices - 1);
                for(int j=0; j<num_uvertices; j++) {
-                       float u = (float)j / (float)num_uvertices;
+                       float u = (float)j / (float)(num_uvertices - 1);
                        Vec3 vtx = hfield_vertex(u, v, calc_height(u, v, ptr), xsz, ysz, height);
 
                        /* calculating normal with forward differences:
@@ -213,5 +213,5 @@ void gen_heightfield(Mesh *mesh, float xsz, float ysz, float height, int usub,
                        *iptr++ = a;
                }
        }
-       mesh->update_vertex_data();
+       mesh->invalidate();
 }