void Render(IntPtr pParam)
{
// Attention!
// The main thing you should keep in the mind is that matrix multiplication order should be
// reversed when passing matrix to pRender3D->SetMatrix or pRender3D->MultMatrix methods.
// camera setup
// here and below matrix multiplication order is reversed
TMatrix4x4 set = TMatrix4x4.MatrixRotate((float)(Math.Sin(uiCounter / 150f) * 65f), new TPoint3(0f, 1f, 0f)) *
TMatrix4x4.MatrixRotate(30f, new TPoint3(1f, 0f, 0f)) *
TMatrix4x4.MatrixTranslate(new TPoint3(0f, 0f, -2.5f)) *
TMatrix4x4.MatrixIdentity;
pRender3D.SetMatrix(ref set);
// Draw entire scene.
// draw tiled grass floor
// Some low-level things will be shown below, mainly for education purpose.
// Of course, there is a way to do the same thing without using low-level API.
pRender3D.PushMatrix(); // save current matrix
// multiplicates current matrix with given one
TMatrix4x4 mult = TMatrix4x4.MatrixScale(new TPoint3(8f, 8f, 8f)) *
TMatrix4x4.MatrixRotate(-90f, new TPoint3(1f, 0f, 0f));
pRender3D.MultMatrix(ref mult);
set = TMatrix4x4.MatrixScale(new TPoint3(8f, 8f, 8f));
pCoreRenderer.SetMatrix(ref set, E_MATRIX_TYPE.MT_TEXTURE); // a simple way to tile texture
// Here is the way for instant rendering of any custom geometry.
pTexGrass.Bind(0); // current texture setup
pRender3D.Draw(ref desc, E_CORE_RENDERER_DRAW_MODE.CRDM_TRIANGLE_STRIP, 4);
set = TMatrix4x4.MatrixIdentity;
pCoreRenderer.SetMatrix(ref set, E_MATRIX_TYPE.MT_TEXTURE); // return texture matrix to its normal state
pRender3D.PopMatrix(); // return previous matrix
// Ok, that's all with low-level things in this example.
// turn off backface culling because of trees leaves (they will look better) and sprites rendering (we want txt and owl to be visible from both sides)
pRender3D.ToggleBackfaceCulling(false);
// draw some trees
// turn on alpha test for correct rendering of trees leaves
pRender3D.ToggleAlphaTest(true);
// precalculate similar for all trees transformation part to make it faster
TMatrix4x4 tree_rotate_and_scale = TMatrix4x4.MatrixScale(new TPoint3(2f, 2f, 2f)) *
TMatrix4x4.MatrixRotate(-90f, new TPoint3(1f, 0f, 0f));
// some copy-pasted code for each tree to draw all of them
pRender3D.PushMatrix();
mult = tree_rotate_and_scale * TMatrix4x4.MatrixTranslate(new TPoint3(2.3f, 0f, 1.2f));
pRender3D.MultMatrix(ref mult);
pTexTree1.Bind(0); // way to set current texture
pMeshTree1.Draw();
pRender3D.PopMatrix();
pRender3D.PushMatrix();
mult = tree_rotate_and_scale * TMatrix4x4.MatrixTranslate(new TPoint3(-2.15f, 0f, -1.75f));
pRender3D.MultMatrix(ref mult);
pTexTree1.Bind(0);
pMeshTree1.Draw();
pRender3D.PopMatrix();
pRender3D.PushMatrix();
mult = tree_rotate_and_scale * TMatrix4x4.MatrixTranslate(new TPoint3(-0.5f, 0f, -1f));
pRender3D.MultMatrix(ref mult);
pTexTree2.Bind(0);
pMeshTree2.Draw();
pRender3D.PopMatrix();
pRender3D.PushMatrix();
mult = tree_rotate_and_scale * TMatrix4x4.MatrixTranslate(new TPoint3(0.75f, 0f, 0.1f));
pRender3D.MultMatrix(ref mult);
pTexTree2.Bind(0);
pMeshTree2.Draw();
pRender3D.PopMatrix();
pRender3D.PushMatrix();
mult = tree_rotate_and_scale * TMatrix4x4.MatrixTranslate(new TPoint3(0.5f, 0f, -1.5f));
pRender3D.MultMatrix(ref mult);
pTexTree3.Bind(0);
pMeshTree3.Draw();
pRender3D.PopMatrix();
pRender3D.PushMatrix();
mult = tree_rotate_and_scale * TMatrix4x4.MatrixTranslate(new TPoint3(-0.75f, 0f, 0.25f));
pRender3D.MultMatrix(ref mult);
pTexTree3.Bind(0);
pMeshTree3.Draw();
pRender3D.PopMatrix();
pRender3D.ToggleAlphaTest(false); // we don't need alphatest anymore
// we use blending for further font and sprite rendering
pRender3D.ToggleBlending(true);
// draw text
pRender3D.PushMatrix();
const string txt = "The very basics of the 3D graphics.";
const float txt_scale = 0.005f;
uint w, h;
pFont.GetTextDimensions(txt, out w, out h);
mult = TMatrix4x4.MatrixScale(new TPoint3(txt_scale, txt_scale, txt_scale)) *
// tex is drawing in rather huge coordinates, so we will downscale it
TMatrix4x4.MatrixTranslate(new TPoint3(0f, h / 2f * txt_scale, 1.25f)); // move text up on half of it's height and little forward
pRender3D.MultMatrix(ref mult);
TColor4 c = TColor4.ColorOfficialOrange();
pRender3D.SetColor(ref c); // set current color
pFont.Draw3D(txt);
c = TColor4.ColorWhite();
pRender3D.SetColor(ref c); // return color back to white
pRender3D.PopMatrix();
// draw owl animated sprite as billboard
pRender3D.PushMatrix();
// here is a way to make a billboard sprite in 3D
TMatrix4x4 cur_matrix = new TMatrix4x4();
pRender3D.GetMatrix(out cur_matrix); // first we must get current matrix
// now we set new current matrix
TMatrix4x4 matr = TMatrix4x4.MatrixScale(new TPoint3((owlGoLeft ? -1f : 1f), 1f, 1f)) *
// the way to mirror sprite picture
TMatrix4x4.MatrixBillboard( // this function will remove any rotation from given matrix
TMatrix4x4.MatrixScale(new TPoint3(0.35f, 0.35f, 0.35f)) *
TMatrix4x4.MatrixTranslate(new TPoint3(owlX, 1f, -0.35f)) *
cur_matrix);
pRender3D.SetMatrix(ref matr);
pTexOwl.Draw3D((uiCounter / 2) % 15); // fast way to render texture as square plane with size 1.0
pRender3D.PopMatrix();
pRender3D.ToggleBlending(false);
pRender3D.ToggleBackfaceCulling(true); // turn backface culling back on here
// draw monster
pRender3D.PushMatrix();
TPoint3 extents = new TPoint3();
pModelZard.GetExtents(out extents); // retrieves dimensions of the model (ex. extents.x is a half of the models width)
// here we will let monster go circles
const float speed = 1.2f;
float angle = uiCounter / 75f;
TPoint3 circle_center = new TPoint3(1f, 0f, 0.25f);
mult = TMatrix4x4.MatrixRotate(-90f, new TPoint3(1f, 0f, 0f)) *
TMatrix4x4.MatrixRotate(angle * 180f / (float)Math.PI, new TPoint3(0f, -1f, 0f)) *
TMatrix4x4.MatrixTranslate(new TPoint3((float)(Math.Cos(angle) * speed), extents.z,
(float)(Math.Sin(angle) * speed)) + circle_center);
pRender3D.MultMatrix(ref mult);
pTexZard.Bind(0);
// this model uses frame based animation, we just need to switch between meshes
uint meshes_count;
pModelZard.MeshsCount(out meshes_count);
pModelZard.DrawMesh(uiCounter % meshes_count);
pRender3D.PopMatrix();
}
