TR3 Sprites vs TR4 Sprites

TheBlueFox · 29-03-24, 16:27

Hey there!

I'm currently developing a tool to convert TR4 levels into TR3 format. Everything is running smoothly except for sprite conversion.
The struct for the sprites:

Code:

struct tr_sprite_texture   // 16 bytes
{
    uint16_t Tile;
     uint8_t x;
     uint8_t y;
    uint16_t Width;        // (ActualWidth  * 256) + 255
    uint16_t Height;       // (ActualHeight * 256) + 255
     int16_t LeftSide;
     int16_t TopSide;
     int16_t RightSide;
     int16_t BottomSide;
};

According to the TRosettaStone:

TR4 and TR5: x and y values are not used in this version. Additionally, formula for Width and Height is changed: now it’s (ActualWidth - 1) * 256 and (ActualHeight - 1) * 256 respectively.

I've attempted a simple conversion formula, but the textures remain distorted/wrong:

Code:

ushort actualWidthTR3 = (ushort)((actualWidthTR4 - 1) * 256 + 255);
ushort actualHeightTR3 = (ushort)((actualHeightTR4 - 1) * 256 + 255);

Any additional information will be appreciated!

29-03-24, 16:27	#1
TheBlueFox Member Joined: Apr 2018 Posts: 62	TR3 Sprites vs TR4 Sprites Hey there! I'm currently developing a tool to convert TR4 levels into TR3 format. Everything is running smoothly except for sprite conversion. The struct for the sprites: Code: struct tr_sprite_texture // 16 bytes { uint16_t Tile; uint8_t x; uint8_t y; uint16_t Width; // (ActualWidth * 256) + 255 uint16_t Height; // (ActualHeight * 256) + 255 int16_t LeftSide; int16_t TopSide; int16_t RightSide; int16_t BottomSide; }; According to the TRosettaStone: TR4 and TR5: x and y values are not used in this version. Additionally, formula for Width and Height is changed: now it’s (ActualWidth - 1) 256 and (ActualHeight - 1) * 256 respectively.* I've attempted a simple conversion formula, but the textures remain distorted/wrong: Code: ushort actualWidthTR3 = (ushort)((actualWidthTR4 - 1) * 256 + 255); ushort actualHeightTR3 = (ushort)((actualHeightTR4 - 1) * 256 + 255); Any additional information will be appreciated!