Hello,
I loaded .obj file model for rendering in DX11, then I read vertices, UV, normal, etc.. from the file.
Sometimes, the mesh position in the 3D modeling software is not 0.0f, 0.0f, 0.0f
How do I get the the world matrix of the mesh based on the mesh space?
How do I get the the world matrix of the mesh based on the mesh space?
The vertex positions are given w.r.t. a reference space. This space is conventionally called the model space. Recomputing the vertex positions w.r.t. another space requires the existence of a model-to-other space transform. This transform must be explicit. It cannot be implicitly given by the vertexes themselves.
The only thing you can do is to estimate another origin by computing the center of all vertex positions (or something similar). This works for symmetric geometry reasonably well. Otherwise you need to handcraft the transform and add / apply it during import.
EDIT: L. Spiro's practical tipps ;D
Slam your head into a wall until you forget what OBJ files are
loaded .obj file model for rendering in DX11, then I read vertices, UV, normal, etc.. from the file.
Sometimes, the mesh position in the 3D modeling software is not 0.0f, 0.0f, 0.0f
load it into the modeler, center it, save it. job done. get a beer! <g>.
loaded .obj file model for rendering in DX11, then I read vertices, UV, normal, etc.. from the file.
Sometimes, the mesh position in the 3D modeling software is not 0.0f, 0.0f, 0.0f
load it into the modeler, center it, save it. job done. get a beer! <g>.
you forgot: ...and then export it in a sane format that can be sensibly loaded.
loaded .obj file model for rendering in DX11, then I read vertices, UV, normal, etc.. from the file.
Sometimes, the mesh position in the 3D modeling software is not 0.0f, 0.0f, 0.0f
load it into the modeler, center it, save it. job done. get a beer! <g>.
The problem is that sometimes I will have a model with multiple meshes in the same file.
So lets say I have a tank model, there must be parts of the tank that will not be centered to 0.0f, 0.0f, 0.0f such as the tank gun
The problem is that sometimes I will have a model with multiple meshes in the same file.
It appears you want to model a hierarchical object - e.g., you want to orient a tank turret which moves with but rotates separately from the tank body itself. If so, reread the responses you've gotten very carefully - in particular, L. Spiro's post (#2). The message is: choose another file format.
Take a look at the OBJ file format. In particular, note "Obj files also do not support mesh hierarchies or any kind of animation or deformation."
loaded .obj file model for rendering in DX11, then I read vertices, UV, normal, etc.. from the file.
Sometimes, the mesh position in the 3D modeling software is not 0.0f, 0.0f, 0.0f
load it into the modeler, center it, save it. job done. get a beer! <g>.
you forgot: ...and then export it in a sane format that can be sensibly loaded.
Is there such a thing as a sane format? I've written a FBX/DAE importer/exporter and they have plenty of madness within themselves.
you forgot: ...and then export it in a sane format that can be sensibly loaded.
good point. i'm using .x and lucked out and found copies of both truespace 6 and rosetta, so i can import just about anything and export it directly to .x used by the game.
