project method

Implementation

void project(Mesh mesh) {
  if (
    !(mesh.material is GroupMaterial
      ? (mesh.material as GroupMaterial).children.any((m) => m is ProjectedMaterial)
      : mesh.material is ProjectedMaterial)
  ) {
    throw ('The mesh material must be a ProjectedMaterial');
  }

  if (
    !(mesh.material is GroupMaterial
      ? (mesh.material as GroupMaterial).children.any((m) => m == this)
      : mesh.material == this)
  ) {
    throw ('''The provided mesh doesn't have the same material as where project() has been called from''');
  }

  // make sure the matrix is updated
  mesh.updateWorldMatrix(true, false);

  // we save the object model matrix so it's projected relative
  // to that position, like a snapshot
  this.uniforms['savedModelMatrix']['value'].setFrom(mesh.matrixWorld);

  // if the material is not the first, output just the texture
  if (mesh.material is GroupMaterial) {
    final materialIndex = (mesh.material  as GroupMaterial).children.indexOf(this);
    if (!(mesh.material  as GroupMaterial).children[materialIndex].transparent) {
      console.warning('''You have to pass "transparent: true" to the ProjectedMaterial if you're working with multiple materials.''');
    }
    if (materialIndex > 0) {
      this.uniforms['backgroundOpacity']['value'] = 0;
    }
  }

  // persist also the current camera position and matrices
  _saveCameraMatrices();
}