Method Animate

engine/Poseidon/World/Scene/ObjectClasses.cpp:512–641

namespace Poseidon
{
void ForestPlain::Animate(int level)
{
    Shape* shape = _shape->Level(level);
    if (!shape)
    {
        return;
    }

    PoseidonAssert(GLandscape);
    // save original position
    shape->SaveOriginalPos();

    if (_singleMatrixT1 || _singleMatrixT2)
    {
        // matrix included in object matrix
    }
    else
    {
        float xC = Position().X();
        float zC = Position().Z();
        // fine rectangles are not used - use rough instead
        // calculate surface level on given coordinates
        float xRel = xC * InvLandGrid;
        float zRel = zC * InvLandGrid;
        int x = toIntFloor(xRel);
        int z = toIntFloor(zRel);
        float xf = x;
        float zf = z;

        int subdivLog = TerrainRangeLog - LandRangeLog;
        int subdiv = 1 << subdivLog;

        int xs = x * subdiv;
        int zs = z * subdiv;

        Landscape* land = GLandscape;
        float y00 = land->GetHeight(zs, xs);
        float y01 = land->GetHeight(zs, xs + subdiv);
        float y10 = land->GetHeight(zs + subdiv, xs);
        float y11 = land->GetHeight(zs + subdiv, xs + subdiv);

        float d1000 = y10 - y00;
        float d0100 = y01 - y00;

        float d1011 = y10 - y11;
        float d0111 = y01 - y11;

        shape->InvalidateNormals();

        Matrix4Val toWorld = Transform();
        Matrix4Val fromWorld = GetInvTransform();

        // convert plane equations to model space
        // change object shape to reflect surface
        // most forest objects are not rotated, only offseted - this can be easily optimized
        bool rotated = Direction() * VForward < 0.99;
        float yOffset = -_shape->BoundingCenter().Y();
        if (!rotated)