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Lighting/Normals problem

Started by samsamm777 Apr 14, 2006 at 9:20 AM 2 replies 400+ views

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Apr 14, 2006 at 9:20 AM

Im making a little program to display a 3dsmax(vrml) model. its my head :) im having massive problems with lighting. my normals outputted by max are indexed so i think thats whats causing the problems. my verts etc are just hardcoded in an array :) any ideas how i can use the indexs for the normals? void drawHead() { #define NUM_OF_TRIANGLES 295 glRotatef(-90,1,0,0); glTranslatef(0,70,0); glShadeModel(GL_SMOOTH); // Enable vertes array, normal array, texture coord array glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_NORMAL_ARRAY); //glEnableClientState(GL_TEXTURE_COORD_ARRAY); // Set vertex pointer, normal pointer, tex coord pointer glVertexPointer(3, GL_FLOAT, 0, meshCords); glNormalPointer(GL_FLOAT, 0, meshNormals); //glTexCoordPointer(2, GL_FLOAT, 0, textCords); float material_diffuse[4] = { 0.5f, 0.5f, 0.5f, 0.3f }; float material_specular[4] = { 0.3f, 0.4f, 0.451f, 0.6f }; float material_shininess[1] = { 30.0f }; glMaterialfv(GL_FRONT, GL_DIFFUSE, material_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, material_specular); glMaterialfv(GL_FRONT, GL_SHININESS, material_shininess); //DRAW THE HEAD! :) glDrawElements(GL_TRIANGLES, NUM_OF_TRIANGLES*3, GL_UNSIGNED_INT, meshIndices); } http://www.sosickclothing.com/stuff/lightingprobs.jpg screenshot of the problem! [Edited by - samsamm777 on April 14, 2006 11:23:00 AM]

nefthy

Apr 14, 2006 at 1:25 PM

If they are indexed reorder them to match you verticles. Or you could load the index, verticles and normals from the MAX file and use glIndexPointer().

samsamm777

Author

samsamm777

Apr 17, 2006 at 2:08 PM

any chance you can expand on that please?

MARS_999

363

MARS_999

Apr 17, 2006 at 7:54 PM

I think you may want to look into glInterleavedArrays() instead.

http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/interleavedarrays.html

You can use this if max has output the vertex data as a single chunk of data. If not you could load them each individually like so

struct Vertex{float vx, vy, vz;float nx, ny, nz;float s, t;};Vertex *vertexdata = new Vertex[numberofVerticesInModel];unsigned int vertexStride = sizeof(Vertex);glVertexPointer(3, GL_FLOAT, vertexStride, vertexdata.vx);glEnableClientState(GL_VERTEX_ARRAY);glNormalPointer(GL_FLOAT, vertexStride, vertexdata.nx);glEnableClientState(GL_NORMAL_ARRAY);	glActiveTextureARB(GL_TEXTURE0_ARB);glBindTexture(GL_TEXTURE_2D, textureObject);glClientActiveTextureARB(GL_TEXTURE0_ARB);glTexCoordPointer(2, GL_FLOAT, vertexStride, vertexdata.s);glEnableClientState(GL_TEXTURE_COORD_ARRAY);

I am not sure if that is what you are looking for but sounds like your data is packed but I have never looked at .max files...

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