public void ApplyBrush(Vector3 hitPoint)
{
if (CurrentTexture == null)
{
Debug.Log("You haven't created a texture for the current mode yet.");
return;
}
RaycastHit hit;
Vector2 texForward, texRight;
if (!GrassManipulationUtility.GetWorldToTextureSpaceMatrix(new Ray(hitPoint + Vector3.up * 1000, Vector3.down),
Epsilon, GrassColliders, out hit, out texForward, out texRight))
{
return;
}
Vector2 texCoord = hit.textureCoord;
//Convert the world space radius to a pixel radius in texture space. This requires square textures.
int pixelRadius = (int)(Size * texForward.magnitude * CurrentTexture.width);
//Calculate the pixel coordinates of the point where the raycast hit the texture.
Vector2 mid = new Vector2(texCoord.x * CurrentTexture.width, texCoord.y * CurrentTexture.height);
//Calculate the pixel area where the texture will be changed
int targetStartX = (int)(mid.x - pixelRadius);
int targetStartY = (int)(mid.y - pixelRadius);
int startX = Mathf.Clamp(targetStartX, 0, CurrentTexture.width);
int startY = Mathf.Clamp(targetStartY, 0, CurrentTexture.height);
int width = Mathf.Min(targetStartX + pixelRadius * 2, CurrentTexture.width) - targetStartX;
int height = Mathf.Min(targetStartY + pixelRadius * 2, CurrentTexture.height) - targetStartY;
mid -= new Vector2(startX, startY);
//Get pixels
Color[] pixels = CurrentTexture.GetPixels(startX, startY, width, height);
//Iterate trough all pixels
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int index = y * width + x;
Vector2 uv = ((new Vector2(x, y) - mid) / pixelRadius) * 0.5f + new Vector2(0.5f, 0.5f);
pixels[index] = ApplyBrushToPixel(pixels[index], uv);
}
}
//Save pixels and apply them to the texture
CurrentTexture.SetPixels(startX, startY, width, height, pixels);
CurrentTexture.Apply();
}
private void RoundDisplacement()
{
Vector2 texCoord, texForward, texRight, inverseTexForward, inverseTexRight;
Vector3 rayOrigin = transform.TransformPoint(offset);
Transform target = GrassManipulationUtility.GetWorldToTextureSpaceMatrix(rayOrigin, rayDirection, maxDistance, 0.1f, grassLayer,
out texCoord, out texForward, out texRight);
if (target == null)
{
return;
}
//Get texture of grass object
var tex = GrassManipulationUtility.GetGrassTexture(target, false);
//Invert the 2x2 world to texture space matrix.
GrassManipulationUtility.Invert2x2Matrix(texForward, texRight, out inverseTexForward, out inverseTexRight);
inverseTexForward.Normalize();
inverseTexRight.Normalize();
//Convert the world space radius to a pixel radius in texture space. This requires square textures.
int pixelRadius = (int)(radius * texForward.magnitude * tex.width);
//Calculate the pixel coordinates of the point where the raycast hit the texture.
Vector2 mid = new Vector2(texCoord.x * tex.width, texCoord.y * tex.height);
//Calculate the pixel area where the texture will be changed
int targetX = (int)(mid.x - pixelRadius);
int targetY = (int)(mid.y - pixelRadius);
int rectX = Mathf.Clamp(targetX, 0, tex.width);
int rectY = Mathf.Clamp(targetY, 0, tex.height);
int width = Mathf.Min(targetX + pixelRadius * 2, tex.width) - targetX;
int height = Mathf.Min(targetY + pixelRadius * 2, tex.height) - targetY;
mid -= new Vector2(rectX, rectY);
//Get pixels
Color[] pixels = tex.GetPixels(rectX, rectY, width, height);
Vector3 forward = transform.forward;
//Iterate trough all pixels
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
var pixel = pixels[x + y * width];
Vector2 dir = (new Vector2(x, y) - mid) / pixelRadius;
//Texture space to world space
dir = dir.x * inverseTexRight + dir.y * inverseTexForward;
float pressure = 1 - pressureStrength * CalcFalloff(dir.magnitude, pressureFalloff);
//Check angle and pressure threshold
Vector2 characterForward = new Vector2(forward.x, forward.z);
if (pixel.b > pressureThreshold && Vector2.Angle(dir, characterForward) < maxAngle)
{
Vector2 displacementDir;
if (directionalDisplacement)
{
var temp = transform.position - lastPosition;
displacementDir = new Vector2(temp.x, temp.z);
}
else
{
displacementDir = dir;
}
float falloff = CalcFalloff(dir.magnitude, displacementFalloff);
//Falloff and strength
dir = displacementDir.normalized * falloff * displacementStrength;
//To color space
dir = GrassManipulationUtility.VectorToColorSpace(dir);
Color newColor = new Color(dir.x, dir.y, pressure, 1);
//Adds the new color to the pixel array
pixels[x + y * width] = blendChanges ? Color.Lerp(pixels[x + y * width], newColor, Time.deltaTime * blendSpeed) : newColor;
}
}
}
//Save pixels and apply them to the texture
tex.SetPixels(rectX, rectY, width, height, pixels);
//Search for texture updater, which prevents multiply applys per frame (for multiple displacers)
TextureUpdater updater = target.GetComponent <TextureUpdater>();
if (updater == null)
{
updater = target.gameObject.AddComponent <TextureUpdater>();
updater.targetTexture = tex;
}
updater.RequestTextureUpdate();
}