DX12 Object Loader

An object loader that can display 3d models in a 3d space using the DX12 library.

Features

• Load 3d models from .obj and .md5mesh files.
• Camera movement (rotating, panning, translating, zooming).
• Animation from .md5anim files using gpu-skinning.
• Load multiple 3d models at once in the same world.
• Create custom 3d models.

How it Works

1. Component based system is used to give the 3d models different attirbutes. These attributes store data of the 3d model such as animation frame data and uv texture coordinate data.

2. Positional data of 3d models during an animation are calculated using bone armatures and weighted vertices. Each frame, the bones in the bone armature are translated and rotated to a different position, and each bone applies a different weight to every vertex in the 3d model which determines how much the vertex should move according to that specific bone.

3. Animations are handled on VertexShader.hlsl via the process of gpu-skinning.

  float4 tempPos;
  tempPos.x = 0.0f;
  tempPos.y = 0.0f;
  tempPos.z = 0.0f;
  tempPos.w = 1.0f;

  // apply weight and rotation
  for (int i = 0; i < 4; i++) {
    float3 weightPos = float3(input.weightsPosX[i], input.weightsPosY[i], input.weightsPosZ[i]);

    float3 rotPos = rotateVectorByQuat(boneRot[input.boneIndices[i]], weightPos);

    tempPos.x += (bonePos[input.boneIndices[i]].x + rotPos.x) * input.weights[i];
    tempPos.y += (bonePos[input.boneIndices[i]].y + rotPos.y) * input.weights[i];
    tempPos.z += (bonePos[input.boneIndices[i]].z + rotPos.z) * input.weights[i];
  }

  float temp = tempPos.y;
  tempPos.y = tempPos.z;
  tempPos.z = temp;

  // set position 
  output.pos = mul(tempPos, wvpMat);
    

Usage

Importing 3d Models

Type the path to the object file in the text box then press import object.

Camera Movement

Rotate: LMB + Move

Zoom: Scroll Wheel

Pan: Shift + LMB + Move

Staff

Programmer: Joon Kang

Mentor: Samil Chai

Work Period

Start Date: 2018-03-11

End Date: 2019-01-13

Privacy

Portions of source code have been removed for privacy purposes.