public float getHeightOfTerrain(float worldX, float worldZ) {
float terrainX = worldX - this.x;
float terrainZ = worldZ - this.z;
float gridSquareSize = SIZE / ((float) heights.length - 1);
int gridX = (int) Math.floor(terrainX / gridSquareSize);
int gridZ = (int) Math.floor(terrainZ / gridSquareSize);
if (gridX >= heights.length - 1 || gridZ >= heights.length - 1 || gridX < 0 || gridZ < 0) {
return 0;
}
float xCoord = (terrainX % gridSquareSize) / gridSquareSize;
float zCoord = (terrainZ % gridSquareSize) / gridSquareSize;
float answer;
if (xCoord <= (1 - zCoord)) {
answer =
Maths.barryCentric(
new Vector3f(0, heights[gridX][gridZ], 0),
new Vector3f(1, heights[gridX + 1][gridZ], 0),
new Vector3f(0, heights[gridX][gridZ + 1], 1),
new Vector2f(xCoord, zCoord));
} else {
answer =
Maths.barryCentric(
new Vector3f(1, heights[gridX + 1][gridZ], 0),
new Vector3f(1, heights[gridX + 1][gridZ + 1], 1),
new Vector3f(0, heights[gridX][gridZ + 1], 1),
new Vector2f(xCoord, zCoord));
}
return answer;
}
private void prepareInstance(Entity entity) {
Matrix4f transformationMatrix =
Maths.createTransformationMatrix(
entity.getPosition(),
entity.getRotX(),
entity.getRotY(),
entity.getRotZ(),
entity.getScale());
shader.loadTransformationMatrix(transformationMatrix);
shader.loadOffset(entity.getTextureXOffset(), entity.getTextureYOffset());
}
private void billboardRotation(Camera camera) {
Matrix4f matrix =
Maths.createTransformationMatrix(
new Vector3f(
camera.getPosition().x,
camera.getPosition().y + DayNightCycle.getSunY(),
camera.getPosition().z + DayNightCycle.getSunZ()),
0,
0,
0,
DayNightCycle.getSunScale());
Vector3f objToCamProj, objToCam;
float angleCosine;
objToCamProj = new Vector3f(0, 0, DayNightCycle.getSunZ());
/*lookAt = new Vector3f(0,0,1);
try{
objToCamProj.normalise();
lookAt.normalise();
angleCosine = Vector3f.dot(lookAt, objToCamProj);
if((angleCosine < 1f) && (angleCosine > -1f)){
if(objToCamProj.x > 0)
matrix.rotate((float)(Math.acos(angleCosine)), new Vector3f(0,1,0));
else
matrix.rotate((float)(Math.acos(angleCosine)), new Vector3f(0,-1,0));
}
}catch(Exception e){
}*/
objToCam = new Vector3f(0, -DayNightCycle.getSunY(), -DayNightCycle.getSunZ());
try {
objToCamProj.normalise();
objToCam.normalise();
angleCosine = Vector3f.dot(objToCamProj, objToCam);
if ((angleCosine < 1) && (angleCosine > -1)) {
if (objToCam.y < 0) matrix.rotate((float) (Math.acos(angleCosine)), new Vector3f(1, 0, 0));
else matrix.rotate((float) (Math.acos(angleCosine)), new Vector3f(-1, 0, 0));
}
} catch (Exception e) {
}
shader.loadTransformationMatrix(matrix);
}
public void render(List<GuiTexture> guis) {
shader.start();
GL30.glBindVertexArray(quad.getVaoID());
GL20.glEnableVertexAttribArray(0);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glDisable(GL11.GL_DEPTH_TEST);
for (GuiTexture gui : guis) {
GL13.glActiveTexture(GL13.GL_TEXTURE0);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, gui.getTexture());
Matrix4f matrix = Maths.createTransformationMatrix(gui.getPosition(), gui.getScale());
shader.loadTransformation(matrix);
GL11.glDrawArrays(GL11.GL_TRIANGLE_STRIP, 0, quad.getVertexCount());
}
GL11.glEnable(GL11.GL_DEPTH_TEST);
GL11.glDisable(GL11.GL_BLEND);
GL20.glDisableVertexAttribArray(0);
GL30.glBindVertexArray(0);
shader.stop();
}
private void loadModelMatrix(Terrain terrain) {
Matrix4f transfomation =
Maths.createTransformationMatrix(
new Vector3f(terrain.getX(), 0, terrain.getZ()), 0, 0, 0, 1);
shader.loadTransformationMatrix(transfomation);
}
