c# - Cutting a XNA model in half by removing vertices and indices -


i attempting cut loaded 3d model in half using monogame (which extremely similar xna). not need in real time performance not huge issue.

i vertices , indices using modelmeshpart such. 

vector3[] vertices = new vector3[part.numvertices]; part.vertexbuffer.getdata<vector3>(vertices);  short[] indices = new short[part.primitivecount * 3]; part.indexbuffer.getdata<short>(indices);

and set them using

part.indexbuffer.setdata<vector3>(vertices); part.vertexbuffer.setdata<short>(indices);

prior though take arrays , try empty out vertices (and indices refer them) positioned behind center z location of model such.

float centerz = modelmesh.boundingsphere.center.z;  (int = 0; < indices.length; += 3) {     short index0 = indices[i];     short index1 = indices[i + 1];     short index2 = indices[i + 2];      vector3 vert0 = vertices[index0];     vector3 vert1 = vertices[index1];     vector3 vert2 = vertices[index2];      if (vert0.z > centerz && vert1.z > centerz && vert2.z > centerz)     {         vert0 = vector3.zero;         vert1 = vector3.zero;         vert2 = vector3.zero;         indices[i] = short.minvalue;         indices[i + 1] = short.minvalue;         indices[i + 2] = short.minvalue;                     } }

but in end looks rather model cut in half. new games programming , comprehension of vertices , indices still extremely poor. missing fundamental, sincerely appreciated.

enter image description here

short.minvalue -32767 since short signed, shouldn't using that, since indice value vertice can't negative. should use = 0 or ushort.minvalue. keep in mind method not cut model in half perfectly, triangles perpendicular center still remain.

you can try this:

if (vert0.z <= centerz || vert1.z <= centerz || vert2.z <= centerz) {     if (vert0.z > centerz) vert0.z = centerz;     if (vert1.z > centerz) vert1.z = centerz;     if (vert2.z > centerz) vert2.z = centerz;            } else {     indices[i] = 0;     indices[i + 1] = 0;     indices[i + 2] = 0;  }

edit: part looks wrong:

part.indexbuffer.setdata<short>(vertices); part.vertexbuffer.setdata<vector3>(indices);

you should pass vertices vertexbuffer , indices indexbuffer. , should use ushort on indices, since theres no reason indice negative.


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