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How to multiply a .3DS local matrix with a Mesh

Started by Gl_Terminator Jun 18, 2013 at 7:53 PM 3 replies 2.9k views

Original Post

Jun 18, 2013 at 7:53 PM

I have succesfully loaded a 3DS file into my C#, but I have a problem I dont know how to interpret the Matrices that I am reading Here is the code case kMeshXFMatrix: { // Local transformation matrix int i, j; float[][] mat = new float[4][]; for (i = 0; i < 4; i++) { for (j = 0; j < 3; j++) { mat = new float[4]; mat[j] = ctx.PopFloat(); } } lmat = new Matrix(mat[0][0], mat[0][1], mat[0][2], mat[0][3], mat[1][0], mat[1][1], mat[1][2], mat[1][3], mat[2][0], mat[2][1], mat[2][2], mat[2][3], mat[3][0], mat[3][1], mat[3][2], mat[3][3]); } my question is how do I multiply this maxtrix with the mesh. I translated this matrix into a 16 float array and I place this code GL.glPushMatrix(); Gl.glMulmAtrixf(mesh.matrix); mesh.draw(); Gl.glPopMatrix(); please I need some advice

RobTheBloke

128

RobTheBloke

Jun 20, 2013 at 10:37 AM

mat and lmat, don't seem to affect mesh.matrix at all? Maybe store the values in mesh.matrix instead? By the way, this is insane:

mat[i] = new float[4];

Why not just do:

float mat[4][4];

It might also be a good idea to set mat[3][3] to 1.0f, and make sure that mat[0][3], mat[1][3], and mat[2][3], are all set to zero.

Gl_Terminator

Author

Gl_Terminator

Jun 20, 2013 at 8:53 PM

Hello i change this mat = new float[4]; into this float mat[4 ,4]; and I placed 0 0 0 1 to the matrix now the objects appear but they all messed up

RobTheBloke

128

RobTheBloke

Jun 21, 2013 at 6:45 PM

but they all messed up

More information required.....

Gl_Terminator

Author

Gl_Terminator

Jun 26, 2013 at 4:27 PM

public static Matrix CreateTranslation(float x, float y, float z) { return new Matrix(new float[4, 4]); } public static Matrix CreateScale(float x, float y, float z) { return new Matrix(new float[4, 4]); } public static Matrix CreateFromAxisAngle(Vector3 v, float r) { return new Matrix(new float[4, 4]); } it seems that I need this functions coded. but I cant find them on the web

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